As you had almost all say, the kids are on a hype thing. It's due to gangsta rap mainly... As a grown man, I can't blame them for having fun for a summer... I won't go as far as saying they're ridiculous (even if they truly are). They are only young guys who are going to be slapped by their mothers when coming to pick them in the police station. And remenber that in France you're not putting your live at risk walking down the street wearing red or blue clothes like in L.A. for exemple. So let's them have fun, learn, and finally understand that they are wrong and ridiculous. I'm sure they will know it one day; so let them learn, we all have been young and stupid...
There's no (true) Crips or Bloods gangs in France, never have, never will (I hope).
I remember asking to an "OG" (older than me) from my former hood if he was aware of those Crips and Bloods gangs. He was like : "Why are they doing that for ? Just to rep their hood ? What for ? Is that bring them money ? It's f...ing stupid ! Look at me, I love Mickael Jackson's music, do I look like him ?" I think he never understood the US street gang culture.

But he was right in some way...
In France the main goal is to find an exit from the hood by any means necessary, not fighting for a street or a block that don't even belongs to you.
Amongst the youngers, you even see some that rep a hood they don't even from just to be feared, and because the "cité" (project, estate) is known for being hard... So it can be funny as hell sometimes !
I wouldn't be so categoric about London as I saw that US-type gang culture many time there. In fact I'm in contact with a south londoner inmate in order to write a book on the colourful charaters of London street gangsters. And believe me, those guy aren't joking...
PS: I know Bg Casper/ OGK/ OG Kim...ect... personally, as I bought his rap album, and even met him. He was a true skinhead hunter in Paris, and a very good Thai boxer too ! He's well respected in his hood (Paris 13). He's also a living proof that even the olders can be caught by the hype !

But to be really honest, I thank God he didn't manage to bring that shit here in Paris, he almost succeeded believe me or not ! At least with the youngest and even with some not so young and obviously silly...

Sadly, desperate guys hanging and smoking weed all day can easily be lured in this kind of stuff sometimes just to dream a few... Anyway, I'd like to know if some of you have news from him, he's cool. A bit too much I know, but he's cool... I know he lives in Thailland for years now...