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human
[X-Men films/First Class] We see Magneto couldn't even move a satellite dish until Xavier opened up suppressed memories inside him, enabling Magneto to do....so much more in later films. Did Xavier ever regret doing that? He created his own enemy.

As we saw in First Class, Erik couldn't even focus to move the satellite dish, but then Charles opens up the "brightest corner" of his memory. We know this physically affected Erik because he even asks Charles what did he just do. 

So that begs the question, is that the point that Charles really unleashed the "Magneto" that he'd later come to know? Charles even says Erik would possess a power no one could match. 

Erik then goes on to lift a sub, a stadium, and even start ripping the earth apart in subsequent films. Makes me wonder if Charles didn't do what he did, the X Men would've.....saved themselves a lot of trouble dealing with Magneto and his brotherhood in the future. 

So does Charles regret making Magneto stronger?
gpt
The only regret Xavier has is that he can't help Eric be happy and peaceful. 

Magneto would have been able to get there eventually, on his own. But Xavier tought him about inner peace. He's actually less dangerous like this.