While I agree that people who take goodwill as a sign of weakness should be deterred, I think that anger as a means to achieve that is a double-edged sword. Per

While I agree that people who take goodwill as a sign of weakness should be deterred, I think that anger as a means to achieve that is a double-edged sword. Perhaps a good method is to use the paper trick and dispose of the anger after it has served its purpose ...