> Drivers generally follow the rules.
No, they don't. They break the rules all the goddamn time. Have you ever been on an American freeway? Most people are going above the speed limit, myself included.
Do you think most drivers give the legally required amount of space in front of their car while driving, especially on the freeway? It's not even close. Do people signal for the legally required amount of time before changing lanes? Again, not close for most drivers.
> I'm just reporting what I see
What you're actually experiencing is that you implicitly accept the status quo of certain rules being ignored for driving, because driving itself is more common (both for you and in general). But biking is different, it's more obscure, so the rule breaking stands out more.
This is very typical of cultures anywhere that driving is more common than biking, which is...well, most places really.