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You don't know, because there isn't one. If the doors are too deformed to be opened normally, there are only three possible axes of ingress or egress to the car. You either break a window or screen, you violently force the door open, or cut the columns and remove the roof. And since I doubt you're suggesting everyone start carrying hydraulic shears and heavy duty circular saws, in their car, window it is.

And if I'm in a situation where I have to break a car window, even if it's only a 1 in a million chance I'll ever be in that situation, I'd rather have one of those hammers than nothing.

Same thing for a seatbelt cutter. I bet if your truck had caught on fire, and the fire was about to breach the fuel tank, you would've loved a seatbelt cutter to quickly free yourself and get out.

Waiting for trained paramedics to extract crash victims is obviously ALWAYS the best options, but if there's an acute threat to the vehicle, like fire, unstable ground or sinking, you CAN'T wait. You HAVE to extract yourself or die. And like I said, in that situation I'd much rather have a hammer and seatbelt cutter than have nothing. In a situation like that, there is no "doing more bad than good". You are dead if you don't extract yourself immediately. Nothing the tools do or don't do at that point could possibly make the situation worse.

This is like arguing that people should be told to not perform chest compressions on people having heart attacks, because it's incredibly unlikely to ever be needed, and the average person won't do the compressions hard or fast enough to be effective anyway.