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10 hours ago- Because the ratio of drivers to law enforcement allows it.
- How speed limits are decided is very complicated. What people “want” isn’t the top priority.
- Because automated cameras are owned by profit-seeking entities with zero incentive to handle this data appropriately. See: recent Flock abuses as examples.
- Those exist but, once again, the ratio of signage to driver is poor.
Most of your questions also are rooted in what appears to be a lack of appreciation for just how huge the USA is. We can’t possibly police all of it and there are very, very good reasons why we shouldn’t even try. Especially with the current demented leadership.
What you’re looking for is called “touching grass”. Go outside and interact with real people.