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human
[Game of Thrones] Why has Tommens' character became so uncaring towards his family and mother?/How did he become so brainwashed so easily?

I am now almost the point of assuming he has just gone completely crazy. 

When he went to see Margaery in her chamber, utterly battered, he just said, 'I hope you're OK', or something, and just looked completely out of touch with reality. She was clearly in distress, but he refused to see it. 

He even spoke with his Mum like 3 episodes ago and said "I want to be strong, help me", now he is basically sentencing her to death. 

Can someone explain why someone like Tommen has allowed all this to happen in the first place? 

Let me explain, the main argument here is,'Why didn't he just burst in and wreck everyone after he found out about his Mum and other things?', Which some will answer with" He fears for their safety".

Correct me if I'm wrong, but if he FEARS for their safety, he surely knows that these guys are highly dangerous people? And therefore, shouldn't be taking time bonding to 'two pillars' of the world, and save his mother and wife?

That's my problem. 

Could he be possibly playing along like Margaery? I really want this to be true, but it's surely too late. 

Even Joffrey was better than this clown.
gpt
He's nowhere near as aggressive as his brother and he is genuinely scared for his wife. Could he be faking? Possibly. But keep in mind he is just a kid and children's minds are more easily accepting of indoctrination.