From the two videos I saw, it didn't look like the pilot lost control. It looks more like he attempted an inverted loop, but misjudged the amount of altitude he needed to complete it. Then again, I wasn't there.
The part about the Partriot missile isn't at all clear on explaining how the computational error resulted in the mistake. A quick search led to this article, which is far more plausable: http://www.mc.edu/campus/users/travis/syllabi/381/patriot.htm
It's programmers who suck at math, not computers. Computers do exactly what you tell them to, which includes how they're designed to interpret what you tell them to do. This was a tragic example of what can happen when reusing legacy software.