And recent history makes it clear it is not a few extreme people, but a large percentage of the population that would not comply with gun registration.
@thackney A guy I know ran into this up in Massachusetts. He had the state firearm license and his .357 was duly registered. They could come into his house at any time to make sure it was stored properly.
He ended up with a crazy girlfriend who attacked him one night. Police were called, he went to jail because he was a white male, cops went looking for his registered firearms. Fortunately, he had taken it out to a shed and they didn't find it.
They issued a restraining order which meant he couldn't go back to his house because she was there. Took him 30 days to evict her despite it not being her residence. Meanwhile she sold all his stuff except for the firearm which was out in the shed. Once he could get back on the property he buried the gun and then moved out of the state.
He didn't do anything, didn't hit her, didn't threaten her, nothing. BUT if they had found the gun at any point they would have charged him and he would now be a convicted criminal. THAT is why they want registration. Because its a tool that can be used to make more people into criminals and thereby unable to own a firearm.