The Houthis attacked the U.S. after we intervened.
The conflict with the Huthis and their antecedents long precedes the latest flare up, and we did not fire the first shots in this latest round.
This boils down to whether Flash believes the purpose of the mission is 'right' or 'wrong.' Which is supposed to be determined by Congress, but has been punted to the President as of 2001.
You can make smart ass comments but there is a very lengthy legal history that says drug smugglers have not been considered a threat that justifies deadly force as a first option. Given that the current administration has stretched legal bounds in many areas there is good reason to be concerned about the legal justification used, which as far as I know is still classified and has not been seen or reviewed by anyone outside the administration.
One thing that I haven't seen so far in this thread is just how effective these strikes really are, or if this is some part of a longer-term or larger strategy. The first part may not be clear for quite a while and the second isn't really clear at all yet. Incoherent is a term that comes to mind.