I'm guessing they're talking about here on Hacker News, where young, rich professionals who may want to live and work in SF are upvoting stuff that undermines rent control.

Which is convenient as they'd like to use their superior purchasing power to acquire nice SF apartments, and rent control blocks them from that goal. So it helps to have economics on your side, to a) make you feel better about yourself and b) to convince others to join your side.

Maybe in this case that's "right", but the fact that we are collectively upvoting the economics that helps us and not approvingly discussing some other economic theory about how importing low-wage software developers would boost the economy makes it political.