Cam Shepherd was the last starting player from my memory, arrested for public drunkeness and jumping up and down on parked cars. Although the caveat is, my memory is not fantastic these days.
But, using players not getting in trouble with the law isn't particularly the strongest argument against cultural change. (The inverse is true though - lots of players in trouble with the law is an argument for cultural change.)
I'd say that attitude is a product of the culture of the team, but it is possible to change attitude without a huge cultural shift. I've always gotten a feeling of arrogance from the Waratahs as a whole, and I thought they'd gone some of the way to remove it, but it's not wholly gone still.
Incidentally, it was Greg Bird, not Inglis, who glassed his girlfriend - just be careful to get those ones right. The Inglis story was that he gave her a black eye while trying to stop her from self-harming (I am not sure either way on the truth of that).