What bothers me the most about Lute's character that many people don't consider
Some people still don't understand why Lute acts this way, think she's overreacting and acts stupid, but let's think about her motivation:
While it was never directly said, the show pretty much implies the exorcists aren't "winners", they were never humans and were created just to execute sinners. Some people still don't believe this, but we have Vaggie being named by Adam and the fact that all exorcists look pretty alike, unlike other angels that all have different shapes and forms, all exorcists look just like regular women with a gray skin and singe in heaven everyone is a genuinely good person, it would be impossible to find sadists who enjoy killing people there. So the thing is that all exorcists were created for one goal: kill sinners and follow Adam's orders. Those are the only things they know and the only meaning in life they have and the only reason why they exist and what they live for.
When Sera and other angels cancelled the executions she literally just took away the meaning of the life of all of the exorcists, they were made for this goal and now, when they don't have this goal anymore and basically their whole life was just ruined. They will have to find some new goal for life which could not even be possible or will have to learn how to leave without any point of life, which is prolly even harder.
And as for the rest of heaven-borns, on the court we could see that no one actually takes the exorcists seriously, they interrupted Lute, neglected everything dhe was saying, didn't listen to her and had no empathy towards her. Even the Voice of the God couldn't care less and didn't even try to calm Lute down or cheer her up. She just shut Lute up like she was nothing. Despite the fact that Lute wasn't the one who created this system, she was only a pawn that was created to follow it, either groomed into it or even being born believing in it. It shows us pretty well that for the rest of the Heaven-borns exorcists didn't really mean anything, they didn't consider their feelings or wishes (which we can also see in Vaggie's backstory), for them the exorcists are just a function and the second this function isn't needed anymore, exorcists can be just thrown out. Maybe they would have to learn to live by themselves just like winners, or maybe they would even be "deleted" as there's no need in them anymore. Regardless of what is supposed to happen to them, it's absolutely understandable why it bothers Lute so much and why she acts the way she does. Because they just took away the only thing the exorcists were created for and lived for and you can't tell me it's not cruel or violent.
We don't know anything about exorcists' personal lives, but since based on Lute and Vaggie they can act like regular people, have regular feelings and can be close to someone, other exorcists could easily be close friends and actually dear to each other, and since many of them were killed, others have lost their good friends which they were clearly not prepared for and considering that they were just created for this and didn't really have a choice there, it was pretty unfair and makes it obvious they all will want revenge, not just Lute. It's just an unfair deal bc the exorcists were sent to straight to death by their leaders without even knowing they will be killed. So no surprise Lute and all other exorcists would be mad as hell. Half of them were killed by those they were made to kill by other Heaven-borns.
As for Lute, the only close person to her we know was Adam, even if she was seem to be rather friendly with other exorcists, based on the way she crossed Vaggie out with no second thought and wasn't even sad, she wasn't very close to them (I mean, it could be some actually personal beef between them that existed before, but honestly it wasn't seem like that and I don't think there were any hints on that). Lute was admiring Adam, she was having fun with him, was trusting him and knew he cared about her. The last thing Adam did before dying for smiling at Lute, meaning she was a dear person for him too. While everyone else from Heaven was dismissing, degrading and ignoring her, Adam was the only one who consider Lute and actual person and who respected her (as much as he can respect anyone). And besides him just being taken away from her leaving Lute with nobody around, but the Heaven didn't care about Adam either, even his own son couldn't care less about him, no one except Lute was grieving or even noticing he isn't there anymore. If for the rest of the Heaven nothing has happened, Lute has just lost the only person she loved and the only person who was nice to her and after that she has also lost the only thing she was born for and was needed for, becoming just no one with no goal and no one around.
So, no matter if you agree with Lute's actions or not, it really makes no sense to say she's overreacting or that her actions are stupid and pointless. She's doing the only thing she can and thinks she should done, the thing she was born to do and the thing that as she thinks will bring exorcists the fair revenge they deserve
