Which, as I said, was bad writing.
16 million people of a powerful races on Earth, with varied and strong abilities - which produced people like Storm and Franklin Richards, aren't helpless without Krakoa's support. They don't have to rebuild Genosha, all they have to survive and go elsewhere. Magneto's lived there by himself without powers.
This Xavier's not into speaking to people unless he can get something out of them for his own agenda and best friends with Magneto, the same person who was crucial in creating the circumstances for M-day incident, as well as letting Genosha being vulnerable to Nova's attack. Not that Krakao's that hot with security itself. Villainous grandma's get in there without breaking a sweat.
Genosha's population is a major priority as a whole to Krkaoa, they want those numbers absorbed into their own and feel entitled to those people. She as doing them a favor, unless they only want them resurrected by their own methods.
In the past she was a written correctly, in Empyre she wasn't.