The distinction is that when you panic, the primal functions of the brain dominate. You react, but without intelligence.
Running from an explosion might be the dumbest thing you could do...although it seems like the right thing to do instinctively.
Retaining rational thinking during a crisis is what prevents a lot of the situations you described.
Heck, as far as drowning, except for those who don't know how to swim, much of that is caused by TRYING to swim when all you need to do is focus on floating well enough to keep your mouth above water. Once you panic, you start flailing about rather than "swimming."