Antisemitism is what got Hitler where he needed to be in order to do all the other awful stuff.
but it is part of a larger problem of regarding people you don't like as less than human.
So jumping on antisemitism is like pulling the first dandelion to invade your lawn. It makes sure the problem doesn't get substantially worse very quickly.
Are those like me who think that Israel causes some of it's own problems and we should not support them antisemetic?
I feel the same about several other countries, but there is no label for that.
Hating them just because of their religion is antisemitic. But do we have an name for hating Islamic semitic folks because of their religion?