For cultural context, i live in germany.

Are you american and really think this is a sane path of action: "The Convention is unlikely to be ratified in the near future because it forbids both the death penalty and life imprisonment for children [...] threatening national control over domestic policy"

To be honest, to me this sounds exactly like immigrants to germany claiming a right to honor slayings because it's part of their culture.

If that's not the statement you tried to make, please clarify what exactly you think is the US' stated reason for not signing it.