Jewish institutions in the US are receiving lots of bomb threats.

American antisemites got a big boost from the troll's campaign.

Criticism of Israel's policy now leads people to false history such as denial of the holocaust.

It's a non sequitur, but that doesn't stop people from following it.

Israel won't end the occupation/siege of Palestine for simple justice, will it do so to avert future antisemitism?

This is comparable to the US and Guantanamo. Imprisonment without trial, whether in Guantanamo or Israel, is not only a great wrong, it also provokes hostility. In the case of the US, Guantanamo recruits supporters for jihadi terrorist movements around the world.