Revolution doesn't actually need massive support, the US revolution had at most 30%. Che started with less than a thousand. You get the support by showing people it's possible. Anytime anyone talks revolution in the US, what's the response? "Hurr wut about the drones and tanks murica fuck yeah f22 m16" Well maybe not that exactly, but thats the gist. And it's what everyone being oppressed but not as much as others thinks, that's what oppressors want all oppressed to think, that its futile to resist, especially outside whatever rules they set up.

Incrementalism has the chance and historically just has suppressed the masses as each group feel they got enough, piece by piece. Say you get rail unions on board. They're gun ho, they'll help sabotage, they're willing to fight to the end, etc; except we chose incrementalism, so when/if we get what they actually want, during the incremental improvement, they stop. They got theirs, and they will be scared of losing it if you go further. So they'll become non revolutionary, then liberal, then conservative, all while growing more hateful and resentful. Not all of them mind you, but enough to hurt or kill your movement. We know this. This is primarily the black Republican vote in the US.