A few popular assumptions that aren't necessarily true: Living is always better than dying. Your actions have an effect on the outcome. You can do it. People should always do what they should. It matters.
By their relative actions aren't they both agreeing that in this situation the one doing nothing to saves themselves is worth less?
It depends on the circumstances.
Sometimes having control over your fight-or-flight reaction is better for you, personally, given your value system, than say trampeling fellow coworkers in a panic on your way out the door.
Don't judge too harshly people who don't share your starry-eyed view of the world. Let them have their peace if they're so resolved.