I am anti-gun, so while you may be right, you shouldn't presume you are about the person you're replying to.
I'm not a moron, I don't know if we could ever learn to live without armies/armed police, and I'm not calling for a drastic change such as "the UK should give up all armed forces", obviously it doesn't work that way.
But you have the same problems for private gun ownership - for example, how would you set about making it illegal in the US given how many people already own guns, it would be a crazily difficult task. However that doesn't stop people from being in favour of finding a way to do it.
Bongs are legal in the US. You just can't advertise them for use with pot. They are sold as water pipes.