Few crimes are planned in the street, homes (where OPSEC can easily be maintained) are the preferred location. Criminals use them as bases from which to carry out crimes, storage facilities to secure their unlawful gains and weapons, and distribution points for the sale of weapons, stolen merchandise and drugs. Kidnappers use them to sequester their victims. Hardly a serious crime in the US (and probably the world) doesn't have its origins in somebody's home.
Many, if not the majority of, serial killers prefer to use their homes as killing grounds for their victims.
Automobiles are used in bank robberies, drive by shootings, burglaries, drug smuggling and just about any other violent crime you can envision. It is the preferred method for transportation to and escape from in most crimes.
Automobiles are easily stolen, and usually stored in plain sight with easy public access; on the street, in a driveway, etc. The average auto thief can defeat the ridiculously simple lock on virtually all cars in 60 seconds or less.
The theory by which you claim law abiding gun owners should be held accountable for the actions of criminals applies in exactly the same way to homes and automobiles.