No, you cause severe speed differential problems between unthinking idiots who blindly follow the law and intelligent people who can do their own risk assessment on what a safe speed to travel is.
You say intelligent people are those who drive riskier (and faster is riskier compared to slower, always) to break the law and dont expect other people to adhere to the same law?
Our definition of intelligent seems to be quite different.
Canada's relatively low speed limits don't stop it from having 2x the per-capita traffic deaths of autobahn-happy Germany.
How many of them are under snowy conditions?
Also a lot auf Autobahn has speed limits.
And speed limits don't really have any effect on the speed people drive, as referenced above.
The solution to that is quite easy: If you get cought 3 times in one year going too fast you lose your drivers license.
You know, your only point for "slow drivers are more dangerous" is that the others are idiotically faster. I dont think that is reason to blame the slower drivers.
but you really can't change human behavior.
Yes, I see that every day when slave owners whip their slaves smoking big tobacco leaves on their horses while their wives are bustling at home with their 12 children.
This is not true, here anyways, we routinely have people that travel much slower then the posted speed limit.
This is typically caused by elderly on the freeway sections of our city.
Yes, that are the most experienced ones, the ones who - and I quote here - intelligent people who can do their own risk assessment on what a safe speed to travel is.
At this point you have basically lost the argument, because the "let every driver decide on his speed based on their assessment" points and derivatives cancel each other out and we are back to physics and biology were faster is more dangerous.