Except "edgy" people view some bastardization of nihilism as a cool thing to aspire to. To this end they view Patrick as an ideal character. Powerful (at least more so than Steven nobody), and the psychopath concept intrigues them because it separates a person from their emotions, which for many people seem like an improvement, as not feeling would hurt less.
These films of destructive and unhealthy people are usually aspired to because even when the characters hit their rock bottom, they still have more money, power, control, and agency than the average viewer.