In case you really need this much of a primer: (some) Muslims don't like Jews because they're following Muhammad's lead. Specifically, Muhammad had this to say about Jews in one of the Hadith:
> The Day of Judgment will not come until Muslims fight the Jews, when the Jew will hide behind stones and trees. The stones and trees will say, 'O Muslim, O servant of God, there is a Jew behind me, come and kill him.' Only the Gharkad tree would not do that, because it is one of the trees of the Jews.
Of course the Jews (for their part) say that Muhammad was a false prophet. On balance though, they also say this about Jesus.
But in the centuries preceding Mandatory Palestine, there was not a sizable Jewish population in the area.
Probably not, since Islam is not thousands of years old.
Regardless though, I'm not sure "Jews weren't being attacked because there weren't many Jews to attack" is much of an argument.
If you can accept that, the same thing with “events related to Mandatory Palestine” in place of 9/11, Muslims in place of Christians, and Jews in place of Muslims should not be much of a stretch.