US left is way too disorganized, but this isn't because of """tone policing""" (no you cannot say slurs) or debating the specifics of ideals (of course the right doesn't do this, they have no ideals, don't copy the child rapists).
It's because of, among other things, a decades-long operation to systemically crack communities, down to there being basically no infrastructure to even meet up at except the library or church, and also to keep everyone so exhausted and distracted they don't bother trying.
Solving problem #1 is harder but problem #2 involves communicating with people locally who you can actually work with (marginalized groups aren't going to work with violent bigots, if this annoys you, talk to the bigots yourself) and joining local orgs to meet needs – rent/utilities assistance, building community toolboxes and fridges, generally moving people away from "barely surviving" so they can actually develop an interest in leftist ideals