Arguably you can only pin the bomber crews on Poe. 😉
Poe, Finn, and Rose get almost everyone killed. Their plan to disable the tracking not only completely fails, but trusting a complete stranger they found in prison well enough to discuss the plan to sneak everyone away in the small transports in front of him leads to most of the rebels dying when they become sitting ducks.
At first Admiral Purple Hair seems like a complete jerk for hiding her plan from Poe, but since his finding out is what allows him to get everyone killed, in hindsight she was absolutely right not to trust him.
I really loathed this aspect of them film. When Leia seemingly turns leadership over to Poe at the end because she likes bad boys, I kept thinking this is nuts. They should have been executing him without trial for mutiny and treason resulting in the deaths of hundreds not looking to him to lead them out of the cave.
Finn should have been put on his knees and shot in the back of the head too, but at least he got some redemption trying to sacrifice himself for everyone else.
I actually thought Finn almost had a good arc in this movie. The whole killing everyone mucks it up a bit, but I enjoyed seeing him go from thinking only about himself at the beginning of TFA to thinking of Rey at the end of TFA and beginning of TLJ to thinking about everyone at the end of TLJ.
Poe I just hate. He was just boring in the first movie, and arrogantly self-centered beyond all redemption in this movie.