Using footage from demonstrations that got out of hand, civil unrest at one point and overblown as well as wrongly cited numbers are all that is to that.
And yes, in Europe there is no such thing as no-go zone where police don't go and all you have is anarchy.
https://www.elysee.fr/emmanuel-macron/2020/02/18/proteger-le...
He is using multiple times the expression "quartiers de reconquête républicaine" ("suburbs for the Republic to re-conquer").
If the President of a country considers he needs to reconquer parts of his own country, don't you think there is a bit of a problem, beyond whatever Fox News might say?
You might think there is some nuance because the areas with risk of Islamic separatism are not _necessarily_ the same as the high-crime areas where the police cannot easily go. But in practice they definitely are. It's not a pleasant situation, but it's the situation.
I can give more background if you are interested, but it is a well-studied problem with no solution in sight.