It's one thing to have the story be set in a lawless world, but it's another to have the hero be so sick and twisted.
It's not even so much that the guy is a product of his environment: in fact, he's a little shit-for-brains troll who gets his kicks from making the people around him miserable, who gets pleasure from wrecking things or degrading people, and who certainly never bothers with things like ethics or morality.
For example, when confronted with a truly decent guy, the 'hero' ends up selling him as a slave to a homosexual pervert, at a loss (even though the 'hero' cares only about money), just to wreck the guy's life, just because he can.
Later, the 'hero' spends an entire chapter trying to rape a woman he imprisoned.
Nice, huh? And half of the people rating this garbage gave it a '10'.
Don't let the nice drawings and decent action draw you in: this is another revolting piece of garbage that's meant to corrupt you, to make you think that living your life this way is normal, inevitable or 'smart', given the world we live in.
Well, certainly you can choose to become a POS banker, or a corrupt politician/police/..., or a drug dealer/murderer, or whatever else you can think of that gives you the easiest and most despicable approaches to wealth and power. You may well get some fleeting, superficial advantages - smart, huh?
As Max Keiser (a non-mainstream commentator whom I like quite a bit) mentions from time to time, studies have shown that traders with diminished empathy due to slight brain damage do better at playing the stock market, apparently because they don't get distracted by concern for others, or by any thoughts of the impact of their actions. This manga tries to convince you that the most logical approach to life is to have ZERO EMPATHY for others, that being a psychopath is normal and desirable.
Fact: you will not only make others miserable if you live your life that way - you will also be miserable yourself, inevitably. WAKE UP!