I'm rusty on DS9 events.
Were they planning to beam down Starfleet Section 31 agents to then literally execute Founders and/or anyone else with phaser blasts to the head?
There's a difference between casualties of war and assassination.
Instead of assassination, could they have first tried a little stronger diplomacy?
Could they have captured those Klingons and forced them to stand trial in front of their own people instead of just assassinating them?
Even if DS9 events developed to the point where that were their only option, I do not see evidence here that this was their ONLY option. They just jumped right to the extreme "solution" because it made Yeoh look cool (they think).
Also I'm a little tired of Klingon politics looking like it always goes down as 5 or 10 Klingons in a room speaking at each other (often more eloquently than any human politicians of the last century I might add). Even if you want to tell me that's how an empire works, it just seems so fake to me. Then each time they do it fans praise it as a deeper examination of Klingon culture...not really....I still have no idea how Klingon *society* works. You mean to tell me their likely billions of disparate citizens just all sit back and go along with everything decided by these 5 to 10 people? Again, yeah, I get it, it's an Empire not a democracy or republic of any kind....but still...anybody feel me?