The idea of democracy is also tied to the idea of human rights.So if the harm the majority causes is "strip this minority of all their rights" the majority will feel that harm. I see.
Principles like the freedom of speech and religion and all the freedoms tied up into the Bill of Rights are also part of a democracy.
Right now we have a minority trying to take away things like the right to have an abortion and the right of homosexuals to marry. Giving a minority power is no great protection of rights.
How is the Bill of Rights enforced in a pure majority rule that decides to do away with the Bill of Rights?
I don't disagree with most of what you have written in this thread, but I do think there needs to be a check against abuse on "the majority" just as there needs to be a check against abuses by government and/or money/power.