The problem with banging the drum about "legitimate criticisms of Israel" is that they're co-occurent with illegitimate criticisms and anti-semitism.
There's also a very special kind of monomania. Some big account will post on Twitter or Facebook lamenting violence. "This synagogue in London got vandalized!" for instance, or perhaps "this US citizen living in the state of New York was beaten and there's security camera footage." Then about 500 people will immediately jump in to post, "Israel is bad!!"
Here, for instance, is Chelsea Football Club tweeting this past May, about a week after a Norwich synagogue was graffiti'd with a Swastika:
https://twitter.com/ChelseaFC/status/1396189477173923853
"Chelsea FC stands with the UK's Jewish community, and Jewish communities across the world, in the face of rising antisemitism. This hatred and intimidation towards the Jewish community is unacceptable and must stop."
Here's a blue check reply (accompanied by dozens of random Tweeters with the same sentiment):
Consider replacing this with any other race. "Discrimination against African-Americans is bad!" posts the NFL, as someone has burned a cross in front of a Black church. But the Twitter replies stridently call out: "Look at the violence in Africa! Look at the dictatorships! Look at all those schoolgirls who were kidnapped in Zimbabwe!" Would you really tolerate that kind of reply for a second longer than it took you to overcome your disbelief?
Ok, true for replies on unrelated subjects, but stand-alone posts with criticism against Israel also attract that kind of people so then what is the solution, to not post criticism against Israel because it attracts antisemitic people? To not create groups on FB about it for the same reason?
African schoolgirls being kidnapped is very different than an apartheid state where the colonizers regularly oppress and murder the indigenous. In May 2021, when that tweet was posted, Palestinian homes were being stolen by what is considered an illegitimate state. Those anti-Israeli posts didn't come out of nowhere.
There's also a very special kind of monomania. Some big account will post on Twitter or Facebook lamenting violence. "This synagogue in London got vandalized!" for instance, or perhaps "this US citizen living in the state of New York was beaten and there's security camera footage." Then about 500 people will immediately jump in to post, "Israel is bad!!"
Here, for instance, is Chelsea Football Club tweeting this past May, about a week after a Norwich synagogue was graffiti'd with a Swastika:
https://twitter.com/ChelseaFC/status/1396189477173923853 "Chelsea FC stands with the UK's Jewish community, and Jewish communities across the world, in the face of rising antisemitism. This hatred and intimidation towards the Jewish community is unacceptable and must stop."
Here's a blue check reply (accompanied by dozens of random Tweeters with the same sentiment):
"Condemning Israel attacks is not antisemitism, Supporting Palestine and against settlers is not antisemitism, Anti-Zionism is not Antisemitism". https://twitter.com/ManarSarhan/status/1396207673473970190
Consider replacing this with any other race. "Discrimination against African-Americans is bad!" posts the NFL, as someone has burned a cross in front of a Black church. But the Twitter replies stridently call out: "Look at the violence in Africa! Look at the dictatorships! Look at all those schoolgirls who were kidnapped in Zimbabwe!" Would you really tolerate that kind of reply for a second longer than it took you to overcome your disbelief?