It's a valid point of view, lively, but it's a question that could (and can) never be answered. Who knows what might have happened? Bin Laden could even have died of a sudden heart attack minutes before the raiders got there. That wouldn't mean they shouldn't have gone. Or whether Bin Laden's natural death, saving him (presumably by God's will) from his enemies, would have inspired his followers even more.

Decisions for action have to be based on the known or probable rather than on the completely unknown or unknowable.

Because the world is as it is and humans are fallible, sometimes those decisions are wrong. This one, I believe, was right.