Hmmn...okay....you can see where I am going with this, right?
If all the High Speed Low Drag and Cop types are saying "IDPA/USPSA will get you killed!" (OH! NOESSS!!!

)
Then I would like for at least one of them to tell me one tactic that they use that theoretically saves their life or the lives of others.
As was mentioned earlier about the whole sticking a gun through a "window" thing.... That's not a window, it's called a "port". And one of the reasons that you DO stick the gun all the way through the port is so the slide or the gun doesn't get caught on the frame and cause a malfunction.
If you only committ halfway, that slide cycling back and forth getting hung up on the frame can knock at least the front sight off.
And a jam too.

So for the experienced USPSA'ers and IDPA'ers, they know to keep their muzzles to the inside the house part of the port.
Unless the course of fire or stage is set up where the targets are at your feet, basically, like this:
http://video.google.com/videoplay?docid=-4724886211339722596#From a legal Monday morning quarterback situation, in my opinion, it would look really, really bad to be inside a house and shoot somebody through a window who was out in the yard.