Or Hakeem Olajuwon, who was a soccer goalie. I'd guess Thabeet and Brimah were goalies, too. Maybe goalies are not taught to trip anybody, largely because they're expected to stay on their feet, unless they're going for a save.
I've played and coached both sports and I think it's ridiculous for anybody to suggest soccer players have some propensity for tripping. Yes, it happens in soccer games, intentionally and unintentionally, but soccer players have no predisposition for doing it in other sports. If you do it deliberately in a soccer match you'll likely get a yellow card, so it's against the rules just as it is in BB. Allen is just a punk.