Registration of automobiles was and still is entirely a revenue generating measure. No public officials or politicians advocate the prohibition of automobiles. Nobody is targeted for harassment over the possession of an automobile.
Registration of firearms is billed not as a revenue generating measure but a law enforcement measure. Registration fails to meet that burden, not a single crime is prevented by gun registration, because - duh - criminals don't register their firearms. Only law abiding citizens who desire to live in compliance with the law register their firearms. Criminals don't give two hoots about living in compliance with the law - duh - that's why they are "criminals".
Registration records offer no value or assistance to law enforcement who are responding to a home or serving a warrant, because firearm registration records do not mean an individual still has the firearm, or if they do, poses a threat with it. The absence of firearm registration records does not mean the individual does not have a firearm or are not inclined to be a threat. The police must presume in every situation when entering a home to serve a warrant that the suspect may be armed until they are secured and taken into custody.
At best, its a 'feel good' measure which promises far more than it can possibly deliver. At worse, because there ARE public officials and politicians who advocate firearm prohibition, and these SAME public officials and politicians are often the most vocal and active proponents and advocates of firearm registration, gun owners are perfectly reasonable to be suspicious of firearm registration.
If the SAME politicians who were advocating a ban on violent video games, were ALSO advocating registration of violent video game buyers and owners, would you not find their motives for registration a little suspicious, given that they have went on record multiple times supporting the prohibition of those games, not to mention the extremely dubious proposition from the start that banning or even registering these video games and/or their owners would have one iota of measurable public benefit?
And of course, the rights argument, but since you didn't want to get into that, I'll leave it be.