I'm the Canadian who was detained by ICE for two weeks

These things wouldn't definitely happen if a reciprocity policy would be in effect. The problem is that if you apply this policy against the US, a country pays its consequences either directly or indirectly. If all countries at least in America agree on to apply reciprocity, maybe things would change a little.

I think boycotting the US would be a more effective option, and I say that as someone who lives in FL (which depends on international tourism heavily).