I agree completely. When I discovered the feature, I posted on Facebook about how cool it was and that I thought every phone should have something that simple to get people help in a desperate situation.
I suppose I could've trained myself to be a bit more careful, but the most common time I sent them on accident, I'd turn the screen off, then immediately remember that I forgot to do something and hit the button to turn it on again, only to twitch just right and accidentally hit the button the third time.
It very rarely actually captured a picture that would be useful if I was actually in trouble. Usually, it was the inside of my pocket, my desk/ceiling, or my lap. Haha