Talking of perversion of justice: Eddie Gallagher killed at least one kid in cold blood and was known to target practice on Iraqi school children. One of his buddies negotiated immunity in order to testify, and then confessed to the murder himself, thereby absolving Gallagher while being immune from any legal consequences.
If that wasn't perversion of justice enough, Trump pardoned him from the only crime Gallagher was officially convicted of: desecrating a corpse.