Seriously, read their lyrics sometime. Rage Against The Machine are the kind of people who NEVER supported your politics in the first place. Tom Morello has written several political op-eds to Rolling Stone. Zach de la Roche is meticulous in his support of causes you would consider to be hardline left-wing.
If you're only just learning this just now, then what the hell do you care? You were obviously never that into them in the first place.