Timothy McVeigh, of the Oklahoma City bombing, the Columbine killers, as well as many of the September 11th hijackers, were all virgins. Many authors and postmodern theorists have made this connection.
This is not an isolated issue. It links together with the lack of economic growth of the last 40 years, the rise of autocracy throughout the world, and the failure of capitalism and secularism to dictate any kind of end goal, purpose, or mission statement other than a kind of bland “do what you want, be you”.
Angela Nagle very effectively even links this to the growth of populism and even the alt-right in her book, Kill All Normies.