I bought a 3'x3' 16g sheet of stainless steel for a backstop and I can shoot all day in my backyard and not have to worry about stray bullets going into my neighbor's yard.
I have a safe full of guns I don't use very often. At least this way I get trigger time when ever I want.
I live in the country and can fire whatever I want whenever I want. Still I enjoy shooting airguns just for the fun of it.
They are quieter thus I don’t have to wear my ear muffs. They can be very accurate and powerful enough for small game.
I have no interest in those heavy caliber, powerful airguns but there are models which will kill anything.
For one thing, I burn my trash but before I put empty pressurized spray cans in the fire, I shoot a hole through them with an air gun. It keeps them from exploding.
I could use a .22LR but the air gun is so much cheaper and less bother.