I resonated with the poster on the point of

來源: 2018-02-17 06:17:18 [舊帖] [給我悄悄話] 本文已被閱讀:

lack of positive male role models in the upbringing of children. Even in up-middle class districts, divorced, single mother and lesbian families increase rapidly in the past 10-20 yrs.

For whatever reasons, it's true that mass shootings were rarely heard of in 50's and 60's. The availability of semi- / automatic weapons mayabe one of the factors, but not all.