Chasing the next social revolution is bound to at some point bring you into conflict with the mitzvot of the Torah. And a Judaism without the mitzvot is like a frat party without a keg. Just look at what the gay marriage thing is doing to the Conservative Movement. I would humbly suggest that the question is not whether Social Justice is the soul of Judaism, but rather, whether it is at all compatable. Let's be honest -- if all the college kids are doing it at the Lefty schools, this is probably a very bad sign.