It’s cause and affect though, if you can’t leave the track (Suzuka for example) it wouldn’t need to be policed.
Correct. The solution is so simple yet they don't do anything about it.
Why do they need vast expanses of tarmac like that? If they are worried about grass/gravel being bad for safety, on some of the big chicanes they have at Abu Dhabi, why not have giant rumble strips/bumps the driver has to go over or weave through to rejoin the track if they want to straight line the chicane?
They will be far enough away from the racing line not to cause a problem for an errant car, but will force a driver to slow down going over them to avoid damage to a car. If a driver wants to risk rejoining the track at race speed to keep a position unfairly gained and damaging the car then they will pay for the consequences.