I don't know of anyone who would describe their experiences with cops as "pleasant."
E.g. pull over (waaaay over. Much farther than you think is plausible), hands visible at all times, very slow movements, eye contact, dome lights on, shoulder muscles relaxed, etc. Most people do ~0 of these things unless they have been coached.
Failing to do these things, esp. while being young/male/profiled socioeconomic group, can drastically change one's experience with the law.
[0] http://www.amazon.com/A-Speeders-Guide-Avoiding-Tickets/dp/0...
I don't see how that invalidates what I said.
"Police oppression" might be a bit farther than I'd go, because I rarely get speeding tickets. But the speed limits are under-posted and you can get a nasty insurance hit even while driving safely.
Even if "but everyone else is doing it" was an excuse, that defeats the argument about excessive law enforcement. If anything there obviously isn't enough law enforcement.
Cars are certainly dangerous. You have a very good point there. But people have so accepted the risk they aren't going to change their entire lifestyle to eliminate it. And in a few years self-driving cars will fix it.