Earlier quoted context omitted.
If sharing wealth leads to greater wealth, then why is it necessary to try to take wealth (by force)? Why don't people willingly give up their wealth so that they can make more? If it is possible to make more wealth by giving up some, why not let people choose whether or not they will share? If you theory holds true, then people who share will get richer and the people who don't share will get poorer and the problem…
People don't always make the rational choice for long term benefits when there are short term gains to be had. Individuals, thanks to bounded rationality, tend to seek satisfactory solutions, not optimal ones. It takes coordinated effort to find optimal solutions. Another way to think of it is, that by benefiting from public goods (roads, law enforcement, health regulations) already in existence you and your family h…
Translation: People are stupid and need to be forced to do the right thing. (Where the "right thing" is defined by the current people in charge.)