I think the answer you are looking for is all staff members should deal with misbehavior in the same way.
But dealing with misbehavior, all in the same way, is unrealistic in the real world. Students should be able to adapt to different situations. If all the teachers do the exact same thing, the students might expect that kind of treatment in the real world and that's not going to happen.
To be detached literally means to be separated or isolated from something. So this word can help to indicate the dead-end and dull aspect of the street.
