I think they are doing that because they are under the mistaken impression that it's only Jewish people that are behind the Muslim invasion of Europe and the third world invasion of the USA and Canada, so they probably consider that to be revenge to try to get Africans to invade Israel.
Of course they would want to destroy Israel anyway. They are anti-Semites, they don't need a reason to hate Jews. They hate for any reason or no reason at all. Evil people don't need a reason to be evil although they come up with them from time to time no matter how silly those "reasons" might be.