Teachers do not expel students, administrators or districts do. Teachers have very little recourse for dealing with "really bad kids (or parents)".

Are you saying Teachers have no input into the process at all?

While they can have input, the goals of the administration and district don't always aline with the goals of the teachers. Teachers want good outcomes for their students. Administration wants to avoid issues that negatively impact budgets, like getting sued by parents.

They have input when it’s a success, when it’s not a success it’s everyone’s fault but theirs.

Funny how that happens.