Ryan is extremely down to earth. Its just after security pushed him around and cussed him out on top of them grabbing a underage girl by the throat that he lost it. If he wouldn't have done it Trevor would have. And we've all seen Trevor knock someone out before.
BDM are the most down to earth people you'll ever meet and they have more respect for their fans than anyone.
Also theres a difference between doing your job right and abusing your power and purposing trying to hurt people. I've seen BDM at various venues so I know they treat security nice. At HOB Ryan was making jokes with security and giving them all high fives and handshakes. So it was clearly this security wannabe tough guy that made Ryan stand up for the band and the fans.
I mean the venue was treating the band like shit anyway.