Most technical faults on a car isn't critical, you can usually just stop.
MOST technical faults on a aircraft are not critical either, you can usually just continue as normal and land as planned. Unfortunately there will always be (no matter what aircraft/automobile) unforeseen faults that cause tragedy .... It's simply the nature of the beast. Anyone that thinks it can be 100% fail safe are just fooling themselves.
I will admit the rotorhead detaching is hard to accept. However, in both, the 330 and 332 instances of the past, both aircraft showed signs and provided time to correct. This one seems different in that manner (though we may find out more in the final report).