Exactly.
Just because someone else claims they did this thing that one time, and it worker....doesn't mean that it was:
- a very lucky success, unlikely to be repeated often
- ethical. Bullets don't always fly straight. They don't always get proper velocity. Shooters arent perfectly steady all the time. Having a lot of extra bullet power will help ensure the animal doesn't suffer when things go only slightly imperfect. And reduce siffering when things got stupid.
Poachers may well be taking down deer with rimfires. But they are not caring about animals suffering, and they are by definition doing illegal activity. To me, poaching is not hunting. Hunters behave responsibly, taking care to reduce or even eliminate suffering.
Now that said...if you are in a survival situation, and you need the food, well, if 9mm or .22 works for you that day, then you and your family can live for days longer, that can be justified because you are reducing suffering of humans. But maybe you get a .223 or .308 in case survival situation occurs...it would be the responsible thing to do.
A 9mm may not even kill a deer sometimes, even days later. So you get no jerky, no trophy, you made an animal limp for the rest of its life. Not really ideal.
So, could it be done? Yes.
SHOULD it be done? NO.
Even if some rednecks assure you it worked that one time, out by the lake, when Bob's truck got stuck in the mud...and they didn't run out of beer till next morning!