Because you guys are oh so worried the government will take your guns if they're registered.
Registration of guns is always the first step...to effective / rapid confiscation programs.
Let's say the government decided to confiscate all Jeep Wranglers for some reason. If they weren't registered it would be practically impossible for Uncle Sam to do that.
but....
Since they are ALL registered [99.9%]..this makes it much more easy for Uncle Sam to confiscate them..
See how that works now Little Bunny...?