Burn The Witch!: Hardly unknown, both in the form in which advanced technology is considered to be magic (see: Magic From Technology) and in the form in which it’s merely considered about as immoral as magic, when dealing with more technologically or socially backward worlds (This is another problem traditionally solved with orbital artillery. As in, say, the Bombardment of Firital.)
Also, historically, what the Somárans did to the founder of the present mainstream eldraeic religion. (See: Outgrown Such Silly Superstitions.) It… didn’t work out so well.