The US government is prohibited from taking a position on religious questions. The nature of evil is such a question. The government frequently declares that something is "bad", but it is not able to declare that something is "evil".
Ah yes, for example the “Axis of Bad” [0] that then-President George W Bush famously named shortly after 9/11. Yes, that prohibition on the Government declaring things to be ‘evil’ is absolutely a real thing that exists in the real world in which we all live.