First, there is the idea that Max should heal Sean and reveal himself to a guy who hates him.
Well and Max and kyle were best buddies
And, even if Liz got him to agree not to reveal Max's secret for the moment, this is a secret that Sean would be privy to for the rest of his life. It was information that he could use anytime he wanted. And it's not like any great regard for Max, or a whole lot in the way of personal scruples, were going to hold him back.
Do you really think that anyone would believe him. At that time there wasn't any special unit anymore. And as you said he is a juvie, if he said anything he would propably be accused of drug abbuse and risk his propabation.
And its not like Sean wasn't vulnerable to blackmail. He was on probation watch if Max and the others accused him of something and planted evidence he would have gone straight back to jail.
Yet Liz is clear that she thinks it's all Max's fault that Sean got stabbed. To listen to Liz, she believes that Max is completely okay with Sean getting hurt, and might even be glad it happened. She totally crushed Max. Again.
Well he is the reason that Sean got stabbed. If Max hadn't warned Brody Sean would have propably overpowered him. Brody might have been innocent but that doesn't chande the fact that he was mentally unstable and threatened everyone with a gun and even shot on Isabel and Michael.
Aside from that Sean didn't know the cause of Brody's mental illness.
For him he was just the regular madman. Would it have been fair if Sean had died because he tried to overpower an armend madman when he got the chance but failed to do so because of Max intervention. Sean wasn't the aggressor in this whole thing he just tried to play the hero.
He had no idea that Brody was going to stab the kid! He didn't say it was okay at all and I'm sure he didn't think that, either. He could only act on what he was seeing.
Well but he did know that the suprise effect was vital for Seans attack and that Brody/Larek wouldn't be happy about beeing attacked and propably hurt Sean for trying
Liz was the one who said that Max must think it was okay for Sean to be hurt
Well the thing is that Max did make an judgement when he decided to warn Brody. He did put Sean at an disadvantage by warning Brody and therefore chose Brody over Sean.