1 - no, we are in this situation because a lot of police simply do not care about the law and routinely violate civil rights. When Jimmy from Alabama, born and bred, "Don't give no rats ass, I'm the law 'round he'e boy", does it make a difference if Jimmy is a citizen? Nope. Why is this occurring? Because Jimmy a) doesn't care because potentially b) Jimmy didn't have to pass much of a standard because c) citizens don't know much of anything about US law -- it's no longer really taught.

2 - Who cares what other countries do? That you'd appeal to the law in other countries about citizens of other countries not following US law because they don't know it is illogical beyond belief. If you want US law to be followed, then appeal to US law.

3 - What about explaining to Jimmy from Alabama?

If you want a standard, citizen from falling out of a uterus onto US soil is a pretty lame one. I'd prefer people who meet a standard of knowledge and ability to apply it.