There are many people who don't circumspect and treat badly. Answer Circumspect is an adjective, not a verb (as used above). He had a reputation of being extremely circumspect in difficult...
Circumspect:The people nowadays are circumspect about the politicians they elect to govern their country.
"After the accident, the engineers were much more circumspect in their planning."
The wheel turned circumspect.
Why not? Sensing he was not among friends, and being unusually circumspect, he chose not to gainsay the officer's account.