The US has experienced and handled racist riots in the past. Riots alone are not a lethal problem to western nations. Granted in Los Angeles we had to call in Marines from Camp Pendleton. The National French Police force is armed with machine guns and they have armored cars. They have the weapons to handle the situation. Personally I was greeted by two machine gun wielding representatives of the National French Police Force in the Nice airport last year. The immediate question is will French politicians put their petty political ambitions ahead of national security issues ? We already know that leftist within the US, will not. What France and Western nations definitely cannot handle is a collusion or melding of Islamic Extremists with our traditional disgruntled occasionally rioting populations. The US does have racist problems within certain communities. For example, within the past year I personally experienced racism against whites from blacks in Cincinnati. A black waitress refused to serve me and my white partner. She then immediately served a couple of blacks who had just entered. Then the white cook walked out and asked if we had been served yet. We replied no, and he just grunted something in disgust and walked away. Me and my partner immediately got up and left. I did not mind it at all since I was not looking forward to a 'Steak and Shake'. It is not what I consider a healthy meal anyway but it was late at night. We ended up in a 'Waffle House' and I ordered a breakfast and ended up with a plate of grease.
We already know that leftist within the US, will.