>comes from environmentally destructive practices, which is a damn good reason to prefer imports.

I'm sure Russia, Venezuela, Iran, Saudi, etc. really care about the environment and their reports about environment sustainability* are totally true.

The average oil producer is a dictatorship, and I suspect the impact of lack of transparency is more important than the drilling method - they have every motivation to cut corners, while American oil is openly regulated. So from the global perspective I doubt American production is more polluting.

* If they even have any.