Well, at least one of the anti-Semitic incidents was from before 2014, or something like that, and only came out recently...
If the Labour Party does fade into nothingness, I think we should all lose something important in politics. Not for itself, perhaps, but unlike in the early 1920s when another great Party disappeared, there is no viable replacement for Labour as an opposition to the Tories. And if the government has nothing to oppose it, it has nothing to fear, and is in principle free to impose whatever policies it likes whether or not we voted for them. You can't vote a government out unless you can vote another one in in its place.