How else would they have gotten the crews into space?Like how in Armageddon it was "easier" to train some miners how to go into space and such rather than to train some astronauts how to be miners...
Then have Harry save the world, of course after having a nice last minute instantaneous (no lag) conversation with his daughter while the asteriod was tumbling in space on it's way to mother Earth.
Snort!Suspense of disbelief if often important for fiction. It let me watch Wanted without wanting to murder whoever wrote it, till it was done at any rate.
Yes, there have been some movies were I forgot to do this and wanted to inflict damage on the director/producer for such crap.
Maybe that is why I prefer comedies. As long as you laugh, it's fun. Speaking of which, one of my favorite comedies is "Commando" with Arnold. What a funny movie.