How in the heck does the detent in a knife "give way" in the closed position? What kind of knife was that? I can't imagine any knife I have accidentally opening on it's own.Tip down, way down. It's just safer that way, besides In my opinion the only reason for tip up is faster deployment. And when the detent in the knife gives way the knife may inadvertently open (downwards, seen it happen) tip down, it doesn't matter if the detent fails or whatever, it's not possible unless it defies gravity and opens upward
But then we'd have a whole host of different problems at that point