This is like in Soccer.. Tanks are like goalkeepers.. Its NEVER the goalkeeper(tank)s fault.. Even if the goalkeeper fails like green from England at the world cup(or like X tank you know)its never his fault..
Why cause you want a confident goalkeeper(tank) if you tell him he´s shit he will get nervous and make shitty decisions and therefor mistakes.. You want a confident goalkeeper(tank)
Tip you goalkeepers(tanks)