Fix you

Mutants are perceived as monsters by humans. They torture them, exploit them and make their lives a living hell.
So many have to endure this until they find their safe haven.
For Sage, as well as dozens of others, Xavier's School for Gifted Youngsters is that safe haven. There they can be themselves without being judged for it and learn to control their powers as well as fighting their past trauma. Everyone can get a second chance, no matter the wrong they've done.
That's the reason why Professor X decided to welcome two of Apocalypse former horsemen to his school.
Little did he know about the chaos he'd cause with this decision, destroying the peace at his school.

[No smut//could contain mature topics/graphic violence later on]