This reminds me of another story on how being tough can work. I also knew a retired prison warden. Nice guy, but you could tell he was tough as nails when needed to be and he didn't take anyone's bull.
He was in charge of a prison in Eastern Virginia somewhere around the 50's, '60's, and 70s.
There was a pretty tough inmate there, but my friend saw something in him. One day he called him up into his office and said "Johnny, how would you like to go to school". Johnny replied "Bleep that, I ain't going to no bleepin school". My friend said "OK, escort this guy to 21 days of solitary confinement". After the 21 days, my friend called him back up to his office. He said "Johnny, how would you like to go to school". Johnny replied, "yes sir, I sure would". He went to school, learned a trade and had a successful release.