Evasion

"If that happens, it will be totally unacceptable."
"It happened."
"Well, then we'll have to double-check to make sure it happened."
"We've done that."
"I'm not sure that is enough. We'll have to triple-check."
"We've done that too."
"So you believe we have enough evidence."
"According to all of the checks that we've made."
"Ah, therein lies the problem. If it hasn't happened, it is unacceptable but if it seems to have happened, then I've got some serious questions about our checking ability."
So your logic is....?"
"If it is totally unacceptable, then it cannot happen."