Was Charlie's Assassin Decieved By Principalities?

The Bible says in Ephesians 6:12, "Our struggle is not against flesh and blood, but against principalities, powers, and the spiritual forces of evil in the heavenly realms." I have been trying to understand how those principalities are influencing people to do horrible things, and believe they are doing good things. I dive into where some of the idealogy may be coming from. Let me know what you think. My prayers go out to Cbarlie Kirk's family. I hope yours do too.