Good example of out of context quoting of even a short post. He said it's not the teachers' job to have the type of control that the original poster was saying that teachers should seize.
He responded to a proposal that it should be with, depending on how you interpret it:
1) An assertion that it is not currently the case. (Probably true, but completely missing the point of a proposal)
2) An unsupported assertion that it should not be the case. (An unsupported opinion in response to a thought out opinion isn't adding much to the conversation. He may as well simply respond "No, your opinion is wrong." A better comment would explain why he has that opinion.)