* Tools wear and break from constant daily use (only war gets that kind of use out of guns)

* Beds frames can be made cheaply and if they break, you can still put your mattress on the floor (bullets don't work well if just thrown)

* You need to sharpen knives pretty often, which is wearing them out, but it is true that good knives will last a good while. (But when was the last time you heard of a knife lobbying group pushing to prevent laws from limiting the knife industry's ability to sell product)

Worth noting that while firearms are fairly durable goods, they do have a lot of wear when they're used regularly.

Trigger pins can wiggle loose. Butt stocks can crack. Springs lose their springiness. Barrels wear down with normal use, and that wear is accelerated to corrosion if they aren't cared for properly. Receivers will crack if used enough.

Sure. That gun in your uncle's safe will probably still shoot fine in 50 years (assuming it was cleaned before it was put away), but competition shooters replace their arms, or major parts in their guns every couple of years or so.

Plenty of tools are used very infrequently, and make up a large proportion of the market. Most households probably have a screwdriver, a wrench, a spade, etc. which rarely get used. Yet people keep buying them.

Wrenches will break if you abuse them - but so will guns.

I don't think either industry depends on such breakage to stay in business.