1. Registered cars still speed and run red lights. I'm not sure about you but, when I'm driving, I usually pay attention to the speed limit. I don't do that strictly because of the chances of being ticketed by the police. I do that mostly because the posted limit is a reasonable speed for conditions. Most drivers have come to rely posted limits, partially to avoid the consequences of a ticket but mostly because they're a good guide.
2. An individual who has had his gun "stolen" 
might then go replace it. Perhaps in a few months, the new gun may also be "stolen" . This kind of thing can't go on forever but maybe a few others are "lost" in rough seas while boating or "lost" while camping. None of those are crimes nor should they be.
3. Now and then there will be someone with criminal intentions who doesn't have a gun and can't find a "friend" from whom he can "steal" one. He may have a friend who has a friend that does have a gun or he may just look up someone who has a gun on the public database. Since this guy with a criminal need for a gun has no special apprehension over hurting folks he doesn't know and that don't know him, he waits for the gun owner, hidden on the owner's walk from his car to his door. Knocks him out with an unregistered crow bar or pipe wrench, steals his keys, ransacks his home until he finds the gun and steals the gun. Maybe he's chosen a gun owner with a few registered guns. He can get a gun and a backup and sell a few to other criminals who won't register them.
The problem with many of these laws is that they are marketed to voters as crime prevention and gun-control.
Control is a myth and the best means to prevent crime is through empowering the public to help. Sometimes that empowerment may be an advertising campaign about safe storage. Sometimes that might include the police giving out discount coupons for gun locks. It could include setting up a means for local police or sheriff's offices to run voluntary BGCs for private sellers who want to be sure that they aren't selling to a prohibited person.
Given the chance and a means to do so, most folks will work to improve the world but the carrot usually yields better than the stick.
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