The player is one of Arsenal's main transfer targets this summer because he's pretty good at football and also is French - two of the things the club normally looks for in its signings. Luckily for everyone involved with Arsenal this isn't the first time he's been in trouble for hitting random people because he also once assaulted a restaurant owner after a traffic accident. Here's the actual news quote:
He's only 21 but I still don't think you need to have 17 year olds hanging around with you in your gang, especially if they're going to do things that makes you want to assault them. Unless of course the 17 year old is a girl, in which case just hang on in there, friend, because soon it's legal everywhere. Although this still hasn't changed my opinion that if you feel like you have to ask for ID before you explore uncharted territories, just don't.
I'd just like to clarify that Yann M'Vila wasn't grooming this young dude.