Compare what is said about the two demonstrations. Same newspaper. I especially liked the part about "America's most tolerant and progressive city."
Here's a fun thought experiment. Pretend that last Saturday morning that you'd like to argue with a large group of people, just for excitement. You take a bullhorn and a soapbox and hop in the minivan. Where do you take your traveling show? To the protest in SF, or the one in LA? Which group is going to beat you up?