Jaden smith was at the believe concert last night in Nottingham. I'm sure there are plenty of adults there looking out for him. What 14 year old wouldn't want that life? Travelling the world. Enjoying yourself and making the best of what life has to offer.
He can be at the Believe concert, no problem there. But when a 14 year old attempting to go to a bar, and starting trouble with the security is the issue here. 14 year olds may want to do all these things, but they are illegal for a reason. 14 year olds (and most time many adults even) cannot handle the life style.
As for Brangelina and allowing their kids to dress how they want: as long as they are properly covered, they are clean and seem healthy, it is no one else's business how they dress.