Driving is dangerous enough as it is. Adding the extra anxiety of getting lit up by a speed-limit camera for accidentally exceeding the speed limit does not make it safer.
Plus, we Americans are inventive. If there were no traffic cops, the wealthy and mischievous would simply modify their cars to hide their license plates when driving past speeding cameras on their normal route.
This is a good way to meet the local police in any jurisdiction with cameras.
We hate speed cameras because Americans like to speed. There is a minority that is privacy focussed. But the majority hate it because most we drive unsafely [1].
[1] https://newsroom.aaa.com/2016/02/87-percent-of-drivers-engag...
There's a stretch of through road around me that had been signed a low 30 my whole life - straight with perfect visibility, sidewalks, decent house setbacks, backyards for most activities, etc. The prevailing speed is 40 (adding 10 is standard and accepted around here). I've never seen or heard of any kind of crash on it.
I tended to keep it to 35 because my parents were always complaining about getting tickets on it [0], and as I got older I decided it wasn't worth worrying about (I would generally end up being tailgated for this). But recently, the city ratcheted it down further to a ridiculous 25 [1]. Since the customary speed is now so far over the sign I've just given up and go 40-45 now while spending the effort to scan for cops.
[0] in retrospect I think they were just unobservant, since there's nowhere really for a cop to hide. I've only ever seen cops sit in one place, and it might as well have a big red arrow pointing at it
[1] along with a lot of other roads, I think they must have gotten a quantity break on the signs. Or maybe just a bad case of affluenza.
Imagine if you pull aside your toddler tonight and take away their ice cream cone, because they sad a bad word 2 weeks ago.