I know people hate Citizens United, but to me, if the debate on this is ever to progress: what's the alternative? Say I and a bunch of my friends donate money to promote some cause; let's say "Black Lives Matter", for the sake of argument. Is that also off the table? Is there to be no ability for people to associate & collectively argue for change (e.g., by buying an ad to raise awareness)?

Or, is it fine when I do it, but not when others do it? Where do I draw the line, between what association for the purposes of political advocacy is fine, and what association isn't fine?