Because you can't cast aspersions on other people posting. Which you do, by accusing others-- educated or otherwise-- falsely of racism.

It may trouble you, but even Zionists cannot just do or say anything they want.  There are boundaries (unlike the State of Israel, which dares not declare its borders. Litani River, anyone?

Blame anti-Semitism I suppose. Anything short of unconditional support for Israel.