One Peter and Kate are just as evil. They both violated children out of selfishness.
Kate did it to gain her father's approval, Peter did it out of want for power, because he couldn't handle that Scott rejected his control, because Scott wouldn't blindly obey him and do as Peter tried to force him to, when Peter tried to control Scott's mind, and tried to make Scott murder his friends, including Stiles.
Peter did NOT do what he do out of trauma, sure he had trauma, but he was already manipulative and abusive before the fire, just look at how he manipulated Derek, when Derek was a teen.
But Peter's trauma does not excuse the harm and suffering he caused to innocents like Scott, like the janitor, like Lydia, like Derek...
Peter did not care about others. Just look at how he hurt everyone around him. And no, he most definitely did not care about Stiles in the slightest.
That's a fantasy fanon built up, not based on canon. He wanted to use Stiles to manipulate Scott, that's all,that's the only reason he offered the bite. Just like he tried to use Stiles to manipulate Scott, by trying to mindcontrol Scott into murdering Stiles in Night School.
Peter didn't kill Stiles in co-captain, because at that point Stiles was still potentially useful to manipulate Scott, and killing him at that point would have turned Scott against him forever, whereas turning Stiles against his will, would have just added another werewolf in the fight against Peter.
The moment stiles was no longer useful to him, Peter would have killed him, just like he did to the nurse that helped him in s1 just like he assaulted, bit and turned Scott, just to use him, to take advantage of him, to violate his mind and body, so he could use him as a distraction for the Argents.
Peter is inherently selfish and cruel. He will always put himself and his need for power first. His family only mattered to him in how they were his, aka his property... Which is the only way he saw Derek and Cora, and Malia... just look at how easily he was willing to sacrifice Malia for his own needs both in s4 and s6...
But most of all, the fact that you think Scott saying something mean to Peter makes it ok for Peter to physically and mentally violate a child in a scene very much reminiscent of a rape scene... That's one of the worst things you ever could have typed.
That's like saying Sties deserved to be beaten up by Gerard because he said something mean to him.
That's like saying Isaac deserved to be beaten up by his father
that's like saying a rape victim deserved it...
Because that's how the scene in the showers was filmed, how it was presented.
a halfnaked child comes out of the showers, he finds himself cornered by two grown man, one of them stops him from running away,while the other assaults him, and violates him. And when it's over, he's left violated, tormented on the floor shuddering in pain, utterly vulnerable to anyone who comes in next...
and you claim 'he did it to himself 'payback is a bitch'?
Seriously?