Come on man. I can only think of one example of them actually messing up a calculation that sent a probe to the wrong place. In this case and in the case of the space shuttles (Columbia or Challenger) it was unexpected things that were impossible to account for. (I'll grant you that there is some evidence that they knew there was a problem on challenger).
It's not like these guys are building matchstick houses. The stuff they build goes into Space. I mean it's not like it's rocket science....oh wait it is. Yes there have been accidents, but you go ahead and put a probe in space for 3 years and see if everything works 100% like you thought it would.
Edit: You say that they constantly make mistakes....okay, give me a few examples.
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