That's not true. We have a ton of these popping up in my neighborhood in places where there haven't been issues.
Also they are owned by private companies that pocket most of the money you pay the fine with.
Why do I need 5 of these on my way to work in the morning? That's 5 times where if I accidentally went too fast I have to pay a private company $200. That's up to 10 times a day I am at risk of a random fee to some company. Insane that you want that