I’ve asked this before, but: Why are drones, specifically apart from military action in general, a big deal? Are there any military actions that would be OK performed by soldiers on the ground but not OK performed by drones?
If you’re willing to risk your own life to kill somebody, you’re probably not lying when you say “it had to be done.”
If you’re willing to risk soldiers and money and political capital but not your own life, it may be politics as usual, but it is still risky to you so there’s a relatively good chance you mean it when you say “it had to be done.”
If you’re risking fuck-all, there is absolutely nothing stopping you from killing innocent people whenever it is politically convenient.