it was predetermined you would respond that way.
If you have any evidence that it was pre-determined rather than determined by course, please do present it.
The notion of "predetermined" appears to be another one of those AS IF notions.
In the Oxford English Dictionary the verb "predetermine" means:
1. To determine or establish (an outcome, course of events, etc.) in advance; to predestine; to decree or decide upon beforehand; to be a predeterminer of or compelling force for.
2. (with infinitive as object). To resolve or decide in advance to do something.
3. To endow with an antecedent tendency or propensity to something; to incline, impel, or direct beforehand; to predispose. Frequently in passive: to be governed by such a pre-existing tendency. Obsolete.
And many of the examples are explicitly religious (note the "predestine" in the first definition), like "God: who (hauing predetermined the destruction of Phaaroh) did, by this meanes harden his hart."
So, one might take the non-religious ones, like "Two world wars predetermined the henceforth inevitable symbiosis of scientific activity and political decision", to be figuratively saying that "two world wars made a symbiosis of scientific activity and political activity inevitable, AS IF predetermined by a higher being".
The notion of some intelligent being's deliberate decision being involved in predetermining an event would lead me to prefer Jarhyn's "determined by the natural course of events" expression rather than "predetermined to happen" with its baggage of "somebody back then decided that this would happen now".
For example, even though the Big Bang is in everybody's causal chain, it would be foolish to say that the Big Bang deliberately decided that I would have pancakes instead of eggs for breakfast this morning.