Gallifrey isn’t my home.
There are moments in every civilization’s history in which the whole path of that civilization is decided; the whole future path. Whatever future the Time Lords might have depends upon the choice that is made right here and right now. Now, you’ve got the tools to kill them; you made them. You brought them up here all on your own with your own ingenuity. You don’t need a human. Kill them or let them live, I can’t make this decision for you.
It’s your planet. It’s your choice.