The way tolerance dies in society is not so much about the initial group of intolerants. They usually are annoying but too small to have enough of an effect. But then a reaction movement pops up, fighting intolerance with intolerance of their own. People outside of the initial group of intolerants start to notice them and identify with them based on their common dislike of the reaction movement. The same thing happens with the reaction movement. Polarization becomes bigger and bigger.

You who think you're the hero of tolerance by fighting intolerance with intolerance, you will not be its savior but its executioner.