yes, there are d-bags everywhere. However if you want to avoid them you can, or you can just tune them out when they speak. Lots of people think they are better than you if they do really well, these tend to be the same people who say stuff like "oh, that professor's allowed to be arrogant, didn't you know he was on Havard Law Review."
I think d-bags flock to law school because d-bags are generally all about money, and they thing law school leads to that.
Just my opinion, but I'm guess you didn't see many of those kids you are talking about at the public interest career fair.