I can't imagine Manafort, or Trump for that matter, thinking their response to Khan was beneficial to the mission. It would also be hard to believe that Trump has surrounded himself with yes men who offer no critique of his responses or counseling about managing future situation. All candidates make mistakes, even though you appear to believe otherwise, but those that learn from them persevere. I think Trump has learned from this and that's a good thing being that it is still early.
‘All candidates make mistakes, even though you appear to believe otherwise’
On what basis do you posit this lie?