Gangs are endemic because this society decided to write off a significant portion of the population.

Given that society baically wants these people to go off quietly and die, and given that young men aren't often so inclined, these boys really have few alternatives to ganglife. It's either join a gang, or be a victim of a gang.

You know that I got mine, get yours attitude some people who are making it in american seem to have?

Well generally, their iditoic theories of governance (and why we don't need one, or the taxes they cost) don't really take into account the outcome of the virtue of selfishness on the losers in that society.

Gangs are the inevitable outcome of such short term thinking.

When you got nothing, you got nothing to lose.

And people with nothing to lose generally don't much care who gets hurt while they getting their share of the pie, now, do they?

Reap what you sow, folks.