Would the 9 mm be my first choice? No.
However, if it was all I had, I think I would be ok with it, as long as I can get to pick the ammo.
Shot placement. If you don't hit the critical bits, caliber is irrelevant.
Ammo choice. If you're not subject to the Hague Convention, spring for good SD ammo that has proven to be reliable in your gun.
There is no shortage of people who have reached ambient temperature because of the 9 mm. Interestingly, 9 mm ammo equals or betters .38 special performance-wise. Yet .38 special seldom catches as much crap.
Worry less, shoot more.
MSgt, USAF, Retired
NRA Life Member
The hardest thing to explain is the glaringly evident which everybody had decided not to see. - Ayn Rand