Accurate statistics are hard to come by, but the statistics that are available all point to it being extremely common. For example:
https://www.unicef.org/afghanistan/.../afg-report-Child Marriage in Afghanistan.pdf
"42% of households across the 5 surveyed provinces indicated that at least one member of their household had been married before the age of 18."
Doesn't matter what the law is when it's not enforced.
I may come back to some of your other points, but this one was too much of a doozy to pass up.
What the hell does that have to do with whether or not they are evil? It has NOTHING to do with that. It may be relevant to how they affect US national security, but even then, they've got a track record or permitting international terrorists to operate out of their territory. But again, whether or not they are evil isn't contingent upon where they want to focus that evil.
No true scottsman fallacy.
I'm reminded of the joke about Brezhnev. After becoming chairman of the communist party, he's showing off to his mother that he has this brand new apartment, this brand new car, a country villa, and even a helicopter. And his mother says to him in a worried tone, "But what if the communists come back?"
"Official" policy is far less important than what actually goes on.