I think what made me change my mind was realising that no one would call for any other people taking attack after attack after attack and then the brutal atrocities of October 7th to just put up with it and accept it. In no other country or conflict are people willing to support islamic extremist terrorist groups over another people as far as I'm aware of.
Also the wilful inability to see and acknowledge that it is in the absolute foundational ideology and manifesto of Hamas that all Jews should be slaughtered or driven out of Israel ie. there is no ability to come to a peaceful diplomatic solution whilst Hamas is in charge of Gaza because they do not want that.
I also find myself asking people well what if it was on our shores what would you actually feel or want to do regardless of what the history of the situation was if you had a people who wanted you dead and driven out of your home (regardless of whether people think it should be your home or not based on events 70+ years ago)?
Plus the fact that these people do not march over genuine intentional genocides that happen all over the world yet in when it involves Israel they can find such passion and rage. Eventually I have to boil it down to that the only difference is that it is Jews and the sad, unavoidable conclusion that yes, that is driven by anti-semitism even if they genuinely cannot see that.
I would not have seen or said this in my 20's or 30's.