I came not to call the righteous, but sinners to repentance.

Somebody explain that verse to me in plain talk... It sounds like Steve is saying that the school shouldn't have kicked the girl out; right???

The school is free to do what it feels is correct. However, they certainly can't claim any overwheening Christian authority for doing so. I have heard and read people who attempt to claim scriptural authority for the decision. There is no such authority.