I agree that 380 is weaker than all the auto pistol rounds you mentioned along with 38 Special. But again I mention that there are very small and lightweight pistols available in 380.By stopping the threat asap i meant a bullet than can penetrate deep enough (for vitals) and expand well enough to incapacitate and from what i have watched and read (not an expert on the matter), it seems the .380 does not penetrate and expand enough for that. Obviously a psychological stop of a threat can happen with a bb gun so there are other variations to consider but it seems generally speaking, the .380 is inferior to the 9mm .40 and 45 service calibers. I could be wrong though. I have recently heard there are some pretty potent .380 rounds so perhaps bullet technology is changing the older views on a diminutive round
Also you mentioned the power of a psychological stop. I think that carries some weight to most attackers that ain't chemically altered. Seriously if you put 2 or 3 rounds of damn near any caliber in a bad guy's abdomen or ass I think he would have more to worry about than continuing his attack. But h
I've never been in that situation and can't say for sure. I do know that if you took a few shots at me and I managed to not die or get hit I would definitely be in retreat mode.