Edited:
3rd or 4th game, actually.
In most games, you are in a modern world, in huge cities, with vehicles and whatnot. I can't see why there wouldn't be weaponry in those environments. Thing is, in Rust we're stranded on a small island with about 12 buildings in total. This isn't DayZ. It's RUUUUUST.
Well your argument is invalid, they said they're gonna add in vehicles later on, and in the towns you could find a gun easily. That way you can learn how to build it. If you wanna play a cavemen type of survival game, go play something else.