ah sorry i believed you wanted to mean they are Palestinians. they are not . ok sorry for my words.
There are a lot of different people in these demonstrations:
lot are not north africans
most of north african origin people don't act aggressive (just a few , as you say, who don't feel French but still in France... they always make trouble)
as well you should add other groups , affiliated to fascist groups , big fans of Soral or Dieudonné with their antisemitic words
Sadly in Iran a minority of Iranians have the same anti semitic words , following the door opened by Ahmadinejad
As you can see in the comment above by a fellow Iranian
these people are brainwashed by their own ignorance . i just hope they wake up and stop believe in stupid stories.