I see nothing wrong in banning assault weapons. Nobody needs an assault weapon unless you're in the military, and then you'll be issued one and get ample training in its safe use.
Okay, so what, in your mind, is an "assault" weapon.
Is this an "assualt" weapon?
The state of California doesn't think so. It doesn't have a pistol grip, the magazine has been pinned to be non-removable, and the capacity has been limited. It's a semi-automatic, chambered for .223 ammo.
Is this an "assualt" weapon?
The state of California doesn't think so. Mechanically it's based on a military rifle, the M14, but chambered in .223 instead of .308 Winchester.
How about this one?
It's chambered in .308, a high-powered military caliber. It's a lever action, but does have a removable box magazine.
The term "assault rifle" is loaded language, not technical language. Using the term suggests an emotional argument, and not a rational argument. What is it you don't want me to own? Scary black rifle aesthetics? Rapid fire functionality? High capacity magazines? High power calibers?