Your statement could be applied to many other aspects of life, not just driving.
As an example, it is illegal to be drunk in a pub as well as a variety of other public spaces, as i’m sure you’re aware. If laws governing drunkenness in licensed premises and public spaces were to be as strictly enforced and the punishments for offenders as severe as the ones you often propose for drivers, I’d bet the rather significant alcohol-related crime, accidents, assaults and deaths in this country could be cut dramatically
If a six month ban from all pubs in the country to anyone who got pissed in a pub,followed by a lifetime ban if they did offend again was introduced, as you have suggested for drivers who got caught doing 25 mph in a 20mph area, I reckon the number of people saved from death or life-changing injuries would be as high if not higher than the lives you would save from an ultra-strictly enforced 20 mph limit on urban roads. So surely you would support such approach for drinking law regulations as well?
Also, would you say the majority of people who enjoy a an alcoholic drink are dicks? I’ve certainly observed far worse behaviour as a proportion of all drinkers than as a proportion of all drivers.
Perhaps you have had a particularly bad lifetime experience of people who drive, but that has certainly has not been mine, and it seems to me you have a strong bias towards motor vehicles and and the people who operate them that make you make generalisations that are not really representative of the majority of drivers.
If all of the above was tldr, dicks will be dicks whether they are driving, drinking shopping or interacting with other people in any life situation.