you can't possibly know that, in the world we live in. Not conclusively - the amount of other factors at play and the ubiquity of those factors - crushing social stratification, pay-to-live capitalism, the overwhelming pressure on people to produce or die (meaning that learning to produce is on them to figure out, and quick, or else.) If you had an example of a society where these things were not at issue, you could more easily make a statement like "their conduct is an unfathomably complex psychiatric issue or otherwise they just need to be punished enough".

It's quite possible that these people would have turned out fine if they grew up provided a path to integrating into society that was less burdensome. It's possible you're right, too, but without controlling for confounding factors there's no way to know.