You are wrong to apply the A leads to B and then C. At the end of the day we are Americans, blocking out the hate of Nazis, Islam, and Confederate flags does not mean we then block the American flag. That is ridiculous and nonsensical. People only do that we they deny being Americans, when they oppose or reject America. Besides, the majority of people saying no to Nazi, Islamic, or Confederate flags, for example, are not doing so as a stepping stone to banning the American flag. Quite the opposite.
You are speaking about “sensible” people.... the Antifa, BLM,Commie types will apply the A leads to B leads to C mentality...why?... because they already have! Sensible people won’t but right now insensible people have the upper hand at least in terms of media coverage...!
If you’re too stupid to see the difference between the Islamists (killed millions of Christians over many decades), Nazis (killed millions of Jewish people) and Confederate southerners I can’t help you.