I'm not in any place to be judgemental of Jon. He's young, dumb and...well, you know how the rest of it goes.
I honestly wonder sometimes how I survived my wild youth; lots of money and fame would have made it even worse. I know he seems cocky, rnc, but he's the UFC LHW Champion and is sitting on top of the world. This latest incident should knock some sense into him (and I hope it does) but some amount of ego and hubris is necessary to be the best in the world, in my opinion.
Just my 2 cents, I think JBJ is a nice guy, he's well-spoken and seems to be a good father. Now if he would do the right thing and marry his "fiance" (high school sweetheart and mother of his kids), I'd respect him more.