What will be, WILL be ... is a tautology
Things just ARE the way they are
Essentially, these are the same tautology just expressed from different perspectives. The ARE tautology can refer either to any present or to all of static spacetime.
P1 Past, present and future are fixed and unalterable. This is derived from the evidence of relativity theory and Minkowski’s block world mathematical formulation of it.
This is an eternalism which applies both to determinists who hold to a static spacetime as well as a non-static spacetime. The determinism put forth by
BSilvEsq seems wholly compatible with both of those sorts of eternalism, although his apparently preferred expressive perspective is that of the non-static internal to spacetime viewpoint. Differences in expression necessarily arise when the perspective changes from one that is imagined as outside of spacetime to one from within spacetime.
As Herman Weyl says: "The objective world simply
is, it does not
happen." But then he immediately adds, "Only to the gaze of my consciousness, crawling upward along the life line of my body, does a section of this world come to life as a fleeting image in space which continuously changes in time."
From within spacetime, the determinism at issue (whether that determinism is physicalism, materialism, naturalism, or what have you) holds that all of those perceived changes are physical, and all of those changes are presumed to occur inexorably and in full accord with the so-called laws of physics such that all which appears to happen is always already determined without there being any possibility of deviation from the determinateness effected by the identified laws (certainly at the macrophysical level).
There does not appear to be any disagreement between the compatibilist and the incompatibilist determinists with regards to this understanding - even if static spacetime proponents might think that the non-static spacetime laws regarding change are actually illusions, since, from the static spacetime perspective, nothing happens.
P2 Compatibilism holds that my will is free insofar as it is not balked by external factors (it cannot be balked by internal factors because internal factors just are me).
As I previously noted, incompatibilist determinists have the compatibilist experience of feeling free when they act in accord with their own desires/wishes. Also as I previously noted, this sense of being free is a sense of being free-from external coercion/control.
C Compatibilism is compatible with the Minkowski block world and so free will holds.
This conclusion is certainly correct with regards to the "free[-from] will", and the free-from will is similarly compatible with the viewpoint which holds to a non-static spacetime which is always determined despite there being happenings that actually occur.
So, on occasion, humans have the experience of being free-from external coercion/control. But some humans on some occasions also have the sense of spacetime not being always determined. Some humans on some occasions have the sense of there being indeterminateness at the macrophysical level. It is this indeterminateness which provides the sense that persons are free-to determine - that is to say settle - which way spacetime is to be determined. Alternatively and more precisely, the sense of there being indeterminateness would indicate occasions at which the processing or the momentum of spacetime could be interrupted. This being free-to is clearly dependent on persons being free-from external coercion/control; being free-from is necessary for this being free-to.
This indeterminateness - if actual - would be sufficient to eradicate the determinism possibility.
However, all forms of determinism deny that there is ever the indeterminateness which is necessary for a person to be free-to.
The compatibilist determininsts identify being free with being free-from external coercion/control; the incompatiblist determinists (seem to, or could) insist that there is more to the sense of being free than being free-from external coercion/control; the incompatiblists (seem to, or could) focus on the conditions necessary for being free-to, and they note that the indeterminateness necessary for being free-to is incompatible with determinism since determinism denies that there is ever such macrophysical indeterminateness. It is in the sense of free-to that persons are not free under the determinism rubric.
Incompatibilist determinists most commonly express the denial of there being macrophysical indeterminateness in terms of the so-called laws of physics. These so-called laws are supposed to be sufficient for precluding any macrophysical indeterminateness, and this leads to the thought of these so-called laws as controlling what humans do. However, many of these same determinists will accede to regarding the laws of physics as descriptive rather than prescriptive, in which case it makes less sense (or no sense) to insist that the laws do any actual controlling.
And, yet, whether the so-called laws are prescriptive or descriptive, determinists of the incompatibilist and the compatibilist varieties agree that there is no macrophysical indeterminateness subject to being determined by human acts. And this is to say that the incompatibilist determinist viewpoint can be expressed without reference to coercion or control, and their focus upon being free-to as incompatible with determinism is in no way supplanted by compatibilism, since it is not necessary that
free be identified only with
free-from to the exclusion of the
free-to.
This being the case, the incompatibilist determinists object to compatibilist determinists arbitrarily restricting
free to the sense of
free-from.