Because if you don't, you are not creating lasting change. Your claims will likely not influence the problem as a whole.

Like the 'divest in genocide movement'. Feels like they want universities to divest, putting shame on then, attacking their morals, putting them as bad guys, but really, what will it actually do if they divest? Will the way stop? Will the weapon manufacturer stop to produce? Of course not. This war is much bigger than this. There's a country at way and they're fighting a petty war.

Social movements should lead actions

Basing a revolution on past revolutions is not using first principles