If you've seen a Maurizio Merli movie, you know that Tanzi isn't going to run off and hide in Switzerland like the cops advise him to. Instead, Il Cinico, L'Infame, Il Violento raises the ethical stakes of the Merli persona's tough-cop tactics by turning him into an outright vigilante, acting without any authorization whatsoever to take out the Chinaman and possibly China's new employer, the American Frank DiMaggio (John Saxon) in the bargain. Cop or civilian, Merli's position always seems to be the same: draconian measures are needed to destroy organized crime; criminals like China and DiMaggio are better off dead than in revolving-door prisons. In this film Tanzi gets to make a teeth-baring speech to that effect, which tells me that Lenzi and writer Ernesto Gastaldi knew that this was red meat for the target audience. Merli's fans must have wanted to hear someone say stuff like that, the sort of rhetoric you hear in some American crime films from the 1930s.
I don't know who's the cynic and who's the rat between John Saxon and Tomas Milian (above), but I'm pretty sure that Maurizio Merli's the fist.
There's no English-language trailer available online, so here's an Italian one uploaded to YouTube by trailersdaculto.