Words mean things - adequate penetration (12-18”) is not over penetration.
Cops don’t carry FMJ but they do all carry bonded bullets or their functional equivalents.
Maybe I was tagged in this thread because I’ve seen people and animals shot with .40 cal JHPs including some at 10mm velocities and maybe I’m a 13 year old girl in mom’s basement- it’s the Internet you get what you pay for.
IME shot placement and adequate penetration to reach vital structures are the primary factors in terminal effects.
Slightly more or less expansion is inconsequential, unless it’s the difference between say nicking an artery or not but, of course, that comes back to … shot placement and penetrating adequately to reach said artery,