Flamestrike
Legend
I've never said a word about "cheating". But that doesn't mean its a good idea.
Actually, you're the one asserting it's a 'good idea' for a DM to adhere to a roll that will TPK a party, and ensure a campaign that is going really well and everyone is having fun comes to an end, simply because the dice tell him to.
I'm saying it's a good idea for the DM to ignore that roll, and I'm pointing out to you the DMG clearly states the exact same, and duly authorizes me as DM to do just that, and for a very good reason.