That is the problem with many older movies, especially ones about renegade cops. They try to justify their extreme measures by pitting them against the absolute worst villains, but in real life for every 1 cop that skirts the rules for good reasons, there's about 100 that do it to quickly secure more convictions, by denying suspects their legal rights.
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Iro's Top 100 Movies v3.0
I really just want you all angry and confused the whole time.