When the young boy, Jake, heard Alister's question, he pondered.
'Power… Do I want it?'
'Without power, I can't do anything in this world. I am powerless and because of that, everyone discarded my life and trampled on me as if I was nothing but garbage on the roadside.'
'If I have power, would my life be more different?'
'If I have power, can I finally let Ellie look at me in a different light and finally obtain her heart?'
'If I have power… Can I finally fix my mistakes and make up for the regrets I had in my life?'
Despite being a mere ten-year-old boy, Jake had already reviewed his life from a mature perspective that was not befitting of his age.
Childish innocence… Jake no longer had it.
He had lost it by the time he had experienced the darkness of this world.
Because of that, Jake wanted to obtain power.
As for why, it was none other than a means to protect himself.