Are you suggesting .22LR is adequate for deer?!? If so, don't. Just don't! In many jurisdictions such hunting is illegal and for very good reason.
where i hunt, it IS legal, and there is NOTHING wrong with that. unless you're a bad shot.
it's illegal because most hunters aren't a great shot. there is nothing wrong with the right person taking a shot with a 22 for a deer. i have LEGALLY taken many deer this way, with iron sights at 100 yards or less.
the truth is, in close range, a 22 has the same killing potential on a deer as most of our hunting gear, (take a bow as an example) at low yardage. the difference between a 22 and a higher power rifle, is "margin for error" most hunters need that cushion, but if you're a good shot, a 22 will do the same job.
your laws exist to 1)protect hunters from themselves, because most hunters shouldn't use a 22 and 2) to protect the animals, because, again, most hunters won't make the right shot.
22s have been used since they were created to hunt deer. there is nothing wrong with it. do you really think a 22 won't drop a deer at 30 yards? but you trust a bow t 30 yards? there is no logic behind that. i've seen elk taken with a 22 (haven't done it myself) but the truth is, it's a shot placement issue, NOT an issue with a 22 round itself.
i'm not suggesting people use it, i'm suggesting that with a good shooter, it will drop a deer just like anything else.
i've never had to take a second shot with a 22 on a deer. because i take my time with my first shot, and make it right. just like with a bow. shooting deer with a slug gun or something like that is a better idea for most hunters, because if a shot isn't perfect, you're still ok, and that deer will still drop.