No, Rajan. In the sentence and phrases I am discussing,be = act like.
All right, act like / be an idiot! Go bungee jumping! Please act like / be a hero and get me another beer from the refrigerator. Mr. X advised the former PM not to act like / be a 'pilot in the cockpit whose flight can be hijacked at gunpoint
No, now you have shifted to adjective complements, where be is the copula indicating possession of a quality. The imperatives that you have listed in #1 and #2 exhort the listener to exhibit or acquire the qualities of honesty and assurance.
#3 -- Via a couple of dictionaries:
make sure: make a point of doing something; act purposefully a