Historically, the modern .45 came to be after 9mm diameter bullets failed to stop certain motivated adversaries in Asia. The other half of the story is that the .45 didn't do any better.
The SEALs that I had worked with all seemed to think that firing multiple shots was the way to go, and were happy with their Sig 9mms for making that relatively easy and having lots of rounds to do that with. Other elite units had a different view.
I think all FMJ is relatively bad. Three .25s to the chest is probably better than one .45 ball round.