...Where do you get this idea?
I mean, you may be right, I'm just not really familiar with anyone who thinks that way. That may just be sampling bias, but the general attitude I've seen is that there's no good reason to ban them from private ownership.
He isn't saying that people support banning them, he's saying people support them being NFA items, requiring registration, extra paperwork, etc. The unacceptable bit is that the registry for new ones is closed, not that it exists in the first place.