I can literally give you a reason for every gun I own.
1) Marlin 60 .22 LR cal. Semi-automatic 18 round fixed tube magazine. Scoped. Best squirrel/chipmunk rifle I own. Around where I live squirrels and chipmunks will get into walls and tear things up. Their natural predators shy away from people, so they breed rampantly and must be controlled. Very accurate rifle that I've owned since I was 12, originally was my only rifle and owned for target shooting. I do eat the squirrels because I believe even hunting to control pests you should eat them if you can. The chipmunks are eaten by cat/dog. Is also used to hunt pigeons on family farm across town, since they cause thousands in crop damage.
2) SU-22 .22 LR cal. Semi-automatic 25 round detachable magazines. Red dot sight. Used for night hunting. Occasionally racoons move in and will attack the cat and go after neighbors chickens. They are mostly out at night, so a small cal semi auto with a red dot is needed since I'm not willing to pay thousands for night vision. Once your eyes adjust to the dark you can see them and the red dot is a 1x non-magnified sight that doesn't make it hard to acquire the target at night.
3) AK-47, 7.62x39 Semi-automatic, varying detachable magazines. 7.62x39 has ballistics very similar to 30-30, which is popular for close range deer hunting. But the 7.62 is cheaper. I believe that for clean kills practicing with your deer rifle is IMPORTANT. Therefore a cheaper round means I can practice more. When I practice more it's easy to get a heart shot and humanely kill the deer quickly. Open sights, used short range at my home in the woods.
4) Ruger American 30-06 bolt action, heavy 30mm tube scope. For longer range deer hunting at previously mentioned farm. In fields the ranges for shooting deer aren't as favorable for 7.62x39, and a 30-06 is needed for longer range humane kills. Hunting at the farm is a double purpose: hunting is a green way to get meat, and the deer do great damage to the crops on the farm and have to be controlled.
5) Beretta 92FS 9mm pistol. I live in Michigan, we have 4 of the top 10 most crime riddled cities in the U.S., and I regularly have to enter 3 of them (Flint, Lansing, and Detroit). When entering those areas not carrying is a mistake. A decent caliber full size pistol is ideal, and I dress to carry it since it's not something I have to carry every day. Yes, I have had to pull it a few times to protect myself and others, no I haven't had to fire it.
6) P-64 9x18 pistol. Very small pistol used for carrying for easy concealment. Bought after the Beretta since the Beretta is very difficult to conceal in some clothing. If entering dangerous areas without being able to dress to conceal the Beretta, the P-64 is used.
7) AK-74, 5.45x39 Semi-automatic, varying detachable magazines. (not to be confused with AK-47, similar rifles, different caliber) .22 LR rifles are great for pest control and some predator control, but not predators larger than weasels/coons and not even small varmints past 80 yards or so. 5.45 is a cheap and flat shooting varmint size round that is effective out much farther than the range of the 22 LR rifles, and can take coyote when they venture too close and threaten mine and neighbors pets. However, it proved not as accurate as needed for some ranges, which lead the next rifle.
8) AR-15, .223 cal Semi-automatic, varying detachable magazines. After the AK-74 proved not accurate enough for longer range coyote shots, the AR-15 was purchased instead. Even when hunting a predator that will kill my pets if given the chance, I still have a duty for humane kills, and accuracy is what allows that. The AR-15 is significantly more accurate and took over predator/long range pest duty from the AK-74.
All guns owned should be regularly practiced with, as accuracy is life and death for protection weapons, and is humane kills in hunting/pest control weapons. So target shooting is regularly done with all rifles/pistols owned.
People that live in cities, without predators, without large scale pest problems, that cannot hunt regularly, that live in safe areas and don't have to go in bad areas, etc (which describes much of the country's population) don't have a need to own guns (though they still have the right if desired). But they then extrapolate that experience to everyone. That's the mistake. Come live at my house for a week and you'll probably see 4 different guns used for 10 different reasons in 7 days. They are tools, and in many areas of the country they are important tools used daily.