@evan I don't know if that impression is accurate or not (though for what it's worth I haven't noticed anything like it -- but maybe Chicago is unusual, or my environment is unusual in some way). Assuming it were true, the first question to ask is always the base rate question: what is the proportion of Palestinians in the general population in the place you're considering? That will have a big effect on how many are even available to be leaders of protests.
In any case, it still isn't specifically a question about Jews participating in leadership roles or not.