Earlier quoted context omitted.
"And sometimes cheating the system is actually regarded highly by the fellow citizens, because the people do not believe in the imposed system. " If you live a totally corrupt system, maybe. But functional societies are based on the notion that cheating is bad, immoral, and nobody should do it. "Now, what is more ethical, doing what benefits the people or doing what benefits such system?" - ha ha ... this sounds like…
People who rob banks are not necessarily psychopaths. For a good (fictitious but convincing) example, see Toby Howard in the film https://en.wikipedia.org/wiki/Hell_or_High_Water_(film) Robbing a bank is universally illegal, but it is not regarded as unethical in general.
Yes it is.
Maybe you live in an interesting developing nation?
Robbing banks, stores, anyone - is considered basically immoral in all of civilization, thankfully.
Yes - not all bank robbers are psychopaths - probably not the majority.
But prisons are fully of people bending reality to justify their crimes.