I think its very possible to distinguish between antisemitism and anti-Zionism. Your argument that Hamas isn’t antisemitic because of one quote is not reasonable.

Schools in Gaza open embrace Adolf Hitler and Nazism. High ranking Hamas leader Fathi Hamad has said, “You should attack every Jew possible in all the world and kill them.”

If one wants to sympathize with the innocent Palestinians, I think that is a noble cause. Excusing Hamas, an extension of the Muslim Brotherhood, is not the way.