Just to toss one more shellfish in the stew:

Arabs are semites. 

"Semites are people who speak or spoke a Semitic language, and they include groups like Jews, Arabs, Assyrians, and Aramaic-speaking peoples. The term originally referred to a linguistic group and is now largely unused outside the field of linguistics, though it was later used to define an ethnic or racial group, most famously by Wilhelm Marr when he coined the term "antisemitism" in the late 19th century." 

hahaha

Recall SNL in 70's weekend update.... along the lines of 

"The UN declared anti-semitism is the same as racism. Sammy Davis Jr said "Oh good, now I can hate myself." 

12 hours ago, Jingthing said:

I'll expand on that in a way you may not like.

Have some Jews sometimes weaponized accusations of antisemitism in unethical ways to deliberately try to suppress legitimate criticisms of Israeli government policies?

Yes, absolutely, and that is very wrong. 

But that in no way follows that all accusations of antisemitism are about that.

Also, we're hearing lately from Israel demonixers / Jew haters (often the same people) that because of the actions of the Israeli government in Gaza which have been very legitimately condemned, it is now open season on Jew hating in general, and because of that Jews are somehow no longer allowed to call out antisemitism when it occurs. And coincidentally or not, it's occurring a lot more than it has in recent years.

Bottom line -- it's complicated.

I agree with this, on all 3 points you're making.