I'm surprised you say that Nick. At any football club, the manager should always set the tone and it's quite obvious at Arsenal that Wenger just indulges these useless little pricks.Not saying it isn't true, but for an away game wouldn't they be in a hotel and on a curfew??
If he did go out, then he has let himself, the manager, the fans and the team down and should be severely reprimanded (possibly even sacked).
I wouldn't blame the manager as Iwobi is a grown man and should know what is expected of him and shouldn't need to be watched 24x7.
In the last couple of months we've had this from Iwobi, Akpom smashing his car up whilst more than twice the limit and Bellerin pouncing around London looking like Little Lord Fontleroy. All in an age where they know that everybody has a camera and a video upload is two clicks away.
I know people will say that they're young men but these are highly paid athletes, representing one of the biggest football clubs in the world. They act more like extras on "I'm a twat from Essex".
Only an indulgent and weak manager would allow it