What is going on over in France?

What is the source of all this rioting?

I've read several opinions
1. Economically poor young Muslim men acting on anger over being shut out of the best of French society.
2. Islamic Jihad against the French
3. It's Bush's fault
4. It's Israel and the Jewish community's fault.

I go with #1.
This is an illustration of the failure of France's bloated welfare system and liberal immigration policies.

Lessons the French can learn from this.
Multiculturalism does not work.
Appeasement does not work