“2A proponents” already don’t give a fuck about the “well-regulated militia” clause in the very amendment they’re supposedly so adamant about.
Some do, some don’t. Some just interpret the phrase differently. Some would say guns are already one of the most regulated products so they’re already “well-regulated.” Also the Supreme Court ruled in Heller that despite it saying “militia” the phrase really means individual people, meaning individual people have the fundamental right to possess firearms, etc. So, I think most of these people are not disregarding it, they’re interpreting it a different way. It’s the SCOTUS official interpretation, so it’s not like it’s a crackpot idea even if it’s ultimately wrong. I know I disagree with SCOTUS on a ton of stuff.