It almost seems like every summer they cast somebody who is a hothead and will be removed from the game so that they can have the drama of the removal.
It's only happened a handful of times, the last one being Chima three years ago.
It's always hard to tell how much was shown and what the real situation was, especially because there were so few witnesses to it in the house. Feeds were off at the time, and all we have to go on is what the houseguests have said about it afterwards. And as we know, these houseguests love to exaggerate (just look at the "gay slur" that Willie apparently made). So who knows what happened.
Willie himself has since said that he intended to intimidate Joe/Frank when he was making those threats about getting kicked out of the house, but didn't actually want to get kicked out. Again, who knows.
Unfortunately, after the amazing first week on the feeds, the house has gotten very boring after Willie's departure. His paranoia really amped up the whole game, and now that the person going this week is a foregone conclusion, strategy isn't the top priority anymore.