Actually not really although I can see how it seems that way.
What can be done in, say, New York City about missing people taken by Palestinian leaders? Can they be found in New York City?
No, they can’t.
But people will get mad about Palestinian leaders. Or about Palestinians. Or perhaps about people from the Middle East or Muslims because they can’t do ANYTHING with the rage they feel seeing these posters.
And so they go after the closest targets to them in New York City. Palestinians. Or people from the middle east. Or muslims. Whoever is closest.
That’s why people were taking the posters down. It can only stir up anger against people who can’t do anything about the problem either.