While I agree with much of what you said, I think it would be better if your examples (gay marriage being good, conservativism and racism being bad) were either replaced with non-political examples or at least no longer all on the same side. e.g. if you wrote about fighting for gay marriage and against socialism, that would be more equal-opportunities political examples.

It would, of course, be different if you'd wrote "protesting about gay marriage makes me more likely to protest conservatives and racism in the future, which I don't want to do."