Hello friend, hope you are having good time.

Harshness and strictness with other depends on situation. If they can be corrected only with this behavior, then they must be treated harsh, and if their is possiblity that they can be corrected through good way, then this is the best option.

I believe good behavior can make correct people too, but in case if they are clever and good to understand things.

Best of luck in the contest.