You're preaching to the wrong crowd really. Tottenham probably had the worst racist abuse out of any club in the world for over 50 years. How many clubs up and down the country sang about Belsen, Austwitz and pro Hitler songs?
As for Ajax, they have always been staunch Israeli for decades. There hasn't been a big issue for it, maybe some of them Italian clubs and Eastern European backward countries.
Amsterdam for me, in European history, is one of the most liberal cities there has ever been. Centuries of acceptance. This is sad what has happened, football and politics should never mix. Unfortunately, and you're well aware, that many posters celebrated Spurs fans getting stabbed by Lazio far right fans. There still lays some deep-seated hatred for the Jewish community.
The Israeli conflict will only add to that and now we see its becoming a common occurrence