I've read nothing on this thread that I totally disagreed with, and I'd add a couple of points.
A.D.D. boys. In the past, they would have been out in the workforce at 15, and have the balancing effect of mature(r) men around them, and work to give them self-respect. Or they'd be in the forces.

Diet, one of Mary's points. We now eat a diet that our ancestors did not subsist and evolve on, with much sugar, international cereals rather than native ones, foods that are modified all the way to genetics, pops and sodas instead of water, added dyes and preservatives. We also take medicines for everything, and have what used to be 'treat' foods everyday.

Susceptible people can now be bullied and hassled electronically as well as manually. Into suicide, sometimes.
I agree with BWL at 06:10, pretty much.