More dinner has been put on the table,
and more vermin eliminated,
and more people murdered (and accidentally killed) in the U.S., with a .22 than any other caliber out there over the decades since it was invented, except maybe the 12 ga shotgun. Rabbits, squirrels, turkeys, raccoons, groundhogs, beaver, coyote, possum, ducks, geese, weasals, badgers, wolverines, otters, nutria, and even deer, elk, caribou, moose, with head & neck shots. Yes, I said ducks & geese too (and quail/chukkar/pheasant for that matter), because when people are subsistence hunting, they don't care about morals/ethic/laws - they 'pot shoot' them. Of course, much less of this subsistence hunting has gone on in the last 40 or 50 years, than in the 50 years prior to that.
So I'd say yes, it's for more than plinking.
I've heard the story here on TFL, that some guy who lived in Alaska happened to overhear a gunstore conversation between the clerk or owner, and an eskimo/inuit who was there for a once-in-a-blue-moon excursion into town, and conversation went something like this:
inuit: "I want something more powerful than what I've been using to shoot these caribou with - I want to upgrade to a *magnum* like some of my other relatives have."
clerk: "OK, here's some rifles in 7mm remmag, .308 norma mag, .300 winmag, .375 H&H mag", etc.
inuit: "No that's too big - I don't need anything like that"
clerk: "hmmm, well I don't understand, can you show me what shells you've been using in your rifle for the game?"
inuit: Pulls a .22lr shell out from his pocket: "This".
The Inuit guy wanted a magnum, alright - a
.22 magnum!!
Do NOT underestimate the power of a .22lr - especially today's high-vel and hyper-vel - it is quite deadly at shortish ranges (out to 75 yards or so) on small game, and also on larger stuff with CNS shots. Which is why you must pay just as much attention to gun safety rules when shooting rimfires as you would with shooting a .50 BMG.