Purdue simulation of WTC plane crash

Purdue simulation of WTC plane crash. Riddled with errors. One of them is the bars within the planes' path are all broken. In photos you can see that is not the case. There is no exact sillhouette of the plane. So where did the wings and other parts go? Apparently they all went into the building. Doesn't make sense. Strong enough to go through the vertical bars but not strong enough to cut through the pillars inside? Inconsistent. And once again, the plane's wings and tail did not cut through the bars. Conclusion: the plane blew up before it fully penetrated the tower. Hence the fireballs.

http://www.youtube.com/watch?v=cddIgb1nGJ8