That's why I really hate reality TV...those people were selected to be on the show for that exact reason...they were the most likely to generate drama.
These people aren't as 'regular' and 'every day' as the shows producers would have you believe...they are profiled and selected with the intent of making the show 'interesting' to the viewer...and usually that means drama.
Same goes for shows like Survivor, Big Brother, Biggest Loser, etc.