In every movement there are going to be extremists and people with prejudice.
However, you don't need to be antisemitic to be anti-Zionist. There are pretty much infinite reasons to denounce Israel, and the state seems to be making more every day.
If I, or anyone else, wanted to make a poignant argument against Israel we could simple gesture to the pile of crimes against humanity the state has committed. We wouldn't need to resort to antisemitism.
However, you don't need to be antisemitic to be anti-Zionist. There are pretty much infinite reasons to denounce Israel, and the state seems to be making more every day.
If I, or anyone else, wanted to make a poignant argument against Israel we could simple gesture to the pile of crimes against humanity the state has committed. We wouldn't need to resort to antisemitism.