The difficult thing compared to driving is the monitoring.
In order for a car to be worth having you have to have it in public. You drive it on public roads where there is always the possibility of cameras, remote operated things that scan thousands of cars a day.
You might be able to get fake plates etc which people do but it's a lot of hassle and not really something your typical ambivalent person can be bothered to do. Most cars are taxed and insured. Things like the right person driving and, not driving under the influence are far more common because you have to physically stop a car to check
I've never been breathalysed or had my insurance checked and know lots of people who risk it because they know the chances of being stopped are tiny. Equally things like motorised escooters are completely illegal on public roads but completely common despite being blantent because there's no real interest in them (especially in estates like mine!)
Things like dog laws are much harder. If you licence dogs, how would it ever be checked when current laws are so definitely broken?
You don't want to have people avoiding vets when animals need it. Checking in Things like vets or parks just encourages people to hide sick animals or rarely walk and train them