If the President does it it's not illegal.
hot leftist anti-imperialist take: that's pretty much standard operating procedure for all Presidents
"If Obama ordered a bombing that killed some civilians at a wedding, would you still support him?"
"well, they must've been terrorists/bad people/evil/etc. and not really civilians, or he obviously would be really sad about it, so of course I would still support him. At least he would be regretful of the bombings before ordering the next one, right?"