Earlier quoted context omitted.
I don't know, man. It's easy to get all abstract with phrases like "support a cause" but we live in a concrete world. Mozilla employs a lot of gay people. Prop 8 was viciously homophobic, both in concept and especially in execution of its campaign. How would you feel going to work knowing your boss's boss thinks you don't deserve rights?
Proposition 8 just confirmed 1000s maybe 10s of 1000s of years of conventional thinking about marriage. If that's "viciously" anything, you're going to have to get used to some degree of viciousness. Gay marriage is quite an anomaly.
So this was far more about withholding something from a group than it was of granting something to that group.
Either way, on the total age of humanity that is an eyeblink and fortunately we are not above progressing. At least, not all of us.