As someone who has been part of the mainstream movement in and around Labour for years the nagging doubt that the closer we got to the levers of state power (as much as any government does, anyway) the more all the weapons, soft as well as hard, would be deployed against us.
Do you interpret the dogged attacks on Corbyn as conclusive proof of this?
Who is the mainstream movement?
Who is we?
All ruling class weapons are on the ruling class table for averting imminent revolution.
Corbyn will compromise like any good Labour leader.