Isn't that what self control is all about, modifying what impulses we act upon and what ones we don't. Going out and buying a £1000 handbag, on an impulse, maybe somewhat foolhardy; especially if you can't really afford it. However, killing somebody, or sexually assaulting a child, on the spur of the moment .......ie. "on impulse" indicates the person has no sef control and is therefore an imminent danger to other people. Usually they like to call "Impulse"........"Temporary Insanity", when it's bad enough to have put them on trial for their actions.