Neither do the X-Men, so what even was the point of them all showing up to argue about bringing her to justice? Super heroes are weird. But anyway, they don't go on trial for the horrible stuff they do. Mostly because artists don't like courtroom scenes.
Because it obviously couldn't have been her fault, given that there was no motivation and it was clearly mind control. And everyone on the team has been mind controlled.
But actually, after House of M, the Avengers abandoned Wanda and refused to even look for her for years. That's mega harsh and much worse than the way the X-Men have ever treated any of their own.