yeah yungy is like sooo bloodthirsty, but you can see the way he genuinely wants to direct his killing towards zam's goal. even before they teamed, he didnt really go after the pili dtowncats of the server, and mostly stuck to people he thought would have a fighting chance (whether he was wrong about that or not). i feel like he jumped at the opportunity to help her because he truly wanted a north star to direct his kills into.
on the surface, he has a self-centered view of how to play on lifesteal, whether that be ruthlessly killing or taking a joke way too far and never really taking responsibility for his actions. but there have been so many times where doubt creeps in and he makes sure his teammates dont think too badly of him.
like when he constantly reassured zam that if they were being too loud she could tell them to stop, being careful and conscious of her feelings in general, worrying over telling her about the chief stuff, always telling pentar how much he hates him saying he'll betray first out of bing, how he made jumpers entire base for her - there are so many small moments that show that hes more than just someone who does whatever they want 24/7.
he creates attachments to his day 1's (chief), his teammates, & pili, and he holds those people close to him and wants to continue to look out for them because of how much he treasures them. the view people have of him on LS is that of someone who is so entirely selfish that he would be willing to drop his teammates on a dime just because.
its just so interesting to hear people think that and see the opposite happen at the same time. one of his main season-long goals is to protect his teammates. pentar rags on him constantly for being self centered, but how kindly he treats zam is a direct opposition to that idea. he hates he cant fight because yeah, he likes to kill people, but he isnt afraid of losing. in fact, if he can get a fight knowing he'll lose, he'd probably still take it. he's more honorable than people give him credit for - if people are pissed off at him for being a ragebaiter and go after him for revenge, he'd welcome it if it meant he could fight. and yet, he is the same person who killed vlc's animals because he was so angry he couldnt kill. (for zam's goal) (and lowkey to get her a heart back for the one she gave away to bacon for repairing their friendship tower).
yungy can be seen as just as flip of a coin cruel as bfb for sure, but he has soft spots. during his argument with pentar that one time, he got so mad pentar wasnt just going along with the joke that he wanted to do anything to shift the guilt of taking the joke too far and place it on the fact that pentar got upset at all.
and yet the complete and utter silence as yungy was flying around before and after they met on that dinosaur was so stark to his usual it was off putting.
after the failed hannah and leo kill from the chorus event, we know that when he's silent he's upset, he's ruminating on everything that happened and trying to find a way to process his frustration at his failure. so with pentar, i think no matter how much he said it was just stupid, that pentar was taking it too far and it wasnt that serious, he was feeling how much he hurt pentar with his comments.
he was so awkward with pentar after that that pentar had to be the one to force them to go back to normal. but yungy wasnt flippantly joking around for the rest of the stream after their conversation. (and im not even sure when the last time i heard yungy joking about pentar being weaker than him lowkey).
he can be cruel because he can feel guilt, he can see where he was wrong, and instead of facing it inward, he lashes outward. the difference between him and like, zam, is that he is using his negative emotions to lash out at others instead of holding them all inside and imploding. then what follows is him doing destructive things like killing vlc's pets, or resenting pentar for being upset instead of just admitting he was wrong, or continuing to lie to zam about the lava cast once he saw how much she really cared about it. its all to protect himself from facing the blame for things he caused, or his frustration for fumbling a kill. to avoid accepting responsibility because doing so means facing his own shortcomings and accepting them.
everyone on the server has felt that way one time or another, like that time mapicc got so sick of losing to bfb during the war that he and spoke tried to orbital spawn. or s5 where zam was so hurt from s4 that she wanted to hurt everything around her. when everything just builds up, and the worst part of it is that you cant really blame anyone but yourself - the fighters for spawn for not being enough to kill bfb, zam not being able to erase the hurt she caused, or yungy always making the same mistakes and never succeeding in the ways he wants to.
all that to say that i think yungy holds a lot of the things he does closer to the chest than they think. and if he really did betray one day that it wouldnt be something he walks away from feeling good about, at the very least. he loves his team, and i truly do believe that </3