Didn't PSL national leadership basically call Walter's resignation letter an attempt to turn a faction into a split in Brooklyn? Isn't that basically accusing him of doing what you say he should be doing if he's not a CIA wrecker?
I think we should be realistic about the poor level of organization in the US, generally. There isn't an automatic other org to join and these folks actually aren't organizing a national-level split, they're just leaving the party and doing whatever thing seems best to them.