I've always struggled to understand the justification for radar detectors. People talk about using them as though they were playing some game with the police radars, yet this isn't a game. The intention of the police, whatever many people think, is to prevent speed accidents. Yes, lots of people claim it's to make money out of motorists, but surely if the motorists didn't speed then the police wouldn't make the money. There's some failure of logic on the part of people who want to use radar detectors, I think. But I've always felt as though I was in the minority on this argument. Still, being in the minority on an argument doesn't necessarily prove you're wrong; it may only mean that a lot of people believe a fallacy.
I don't enjoy speed restrictions either, along with most drivers. I always think I can drive safely at the speed I'm going at. But the issue isn't what I think, but what the law is. And in general, the law has accepted the argument that people are killed because they don't know how to control speed. Of course there are drivers who can control speed, but they're a minority, and many people have illusions about their ability to control speed. This becomes obvious on days when the weather is iffy, such as heavy rain, or frosts, or snow (it's just started to snow outside again as I write). Some people don't change their driving habits on those days at all, which to me is foolish. But again, I'm probably in the minority on this argument.