Nice people can also be killed. For example, witnesses to crimes, businessmen who "annoy" their business rivals, house owners who surprise thieves during burglaries, people get killed during robberies, for jealousy etc. I am asking myself why Gosho (and many other Japanese writers) tend to avoid such plots.
And, even when the victims aren't nice people, why are they never eliminated by accomplices, but always by people whom they made suffer?