You can make the same argument about drugs. LE infiltrates a drug ring and allows dealers to sell to buyers. Suppose one of them dies. Under the law, the vendor gets 20+ years for contributing to the death of a person, not LE. I'm not saying it's right, I'm just saying that's how liability works under the law. LE gets off for a lot of shit. They basically have no equivalent of a good Samaritan law.