So, a few observations.
1- please don't call people, even in generalities, "idiots" or "stupid" for doing something you don't. Just not cool.
2- Why do it? You may be surprised why. I shoot 120gr in my 62-cal. Why? Not because I think deer require that for killing. I do that because that's where my barrel shoots well, and where my sights regulated and where I got a trajectory I was happy with. Essentially, it's max rise is about 2" at 50 yards, and it's about an inch low at 100. Yes, I verified that with shooting into paper at the range. So I can point and shoot without thinking to 100 yards. That's why I shoot that charge.
3- not wanting the ball to exit... Wasted energy? I guess I don't see why anyone cares if it's wasted? It will take X amount of force to push a given size lead ball through a deer. If the ball doesn't have that amount of force, it won't exit. If it has that much or more, it'll exit. I don't buy into the idea that the ball/bullet that doesn't exit delivers MORE energy. It simply didn't HAVE enough to get out the other side. For tracking purposes, I want the deer to leak as much as possible. Are all shots broadside? I'd like them to be, but that ain't always so. I shot one this past January that was not oriented as I thought she was. THANK GOD that ball exited, because the hit, while spot on with where I held, wasn't the most ideal shot placement for how the deer stood, and the two holes helped me find that deer. Stuff happens when you hunt live critters. Two holes help find dead deer. I've killed enough and helped find enough for others where one of the holes was plugged with fat/organs/etc that it was essentially NOT a hole. If that was the ONLY hole...and I've found a few of those....the track job is not fun. It's real work sometimes.
To me, if I find something that works as I noted on my 62's load above, I don't care about the powder, wherever it winds up being for charge weight. Only way you know what's in my charge is if I tell you, so I don't see how it's a badge of honor to shoot a lot or a little. While Magnumitis is real, anti-magnumitis is JUST AS REAL. There's a mentality that says "you don't need [insert rifle caliber, powder charge, bow draw weight, optic brand, etc here] to kill deer, and I'm gonna prove it by shooting [insert example small caliber, charge, etc here]." Ok, cool. If you're killing 'em clean, go to it. I don't really care and don't use it to judge you as a hunter. It is what it is. If it's workin' for ya, I'm in no position to tell you it's wrong.
So why do we do that to each other? Why do we say "gee, bud, you're really dumb for shooting [insert whatever topic du jour here]. You don't need that to kill deer." Why? Who flippin' cares?
Powder is cheap when compared to all the other things we do to hunt.....when I find what works for me and my rifle, I use it. I don't give a rip about how much powder I use. It's not 1760. I don't have to REALLY worry about powder, do I? Sure, I might not be able to get it at 8pm the night before the season, and I might have to plan ahead and buy with some planning involved, but really...is powder charge weight going to take someone out of hunting because they shot...what...20 gr more than maybe what they could have used? I just can't see that being true.
I guess I'm the weird one, but seriously...why on earth does anyone care what the next guy uses? Sure, you could ask and maybe learn from what others use, but if it's not for you, then move along. Why judge their decisions?