Without having seen the specific kind of “hatred and harassment” they’re talking about, I can’t form a valid opinion. I wonder, though, if people are interpreting fair criticism of the Israeli government as “antisemitism”. Fair criticism and antisemitism are two very different things, but I often see them confused.
Similarly, I wonder if people are trying to disguise hateful antisemitism as “fair criticism” when there’s nothing fair or reasonable about it.
As always, it will be difficult to protect freedom of speech while preventing and punishing hate speech.