In their book "Freakonomics", authors Steven Levitt and Stephen J. Dubner make the argument that children that are born after their mothers are refused an abortion are much more likely to commit crimes or refuse to recognize authority when they reach adulthood. They further argue that the Decreței are exactly the same people who spearheaded the effort to violently overthrow Ceaușescu's regime in 1989. In that year, the oldest Decreței would have been 22 years old, in the general age range of most revolutionaries. Levitt and Dubner note that Romania was the only east-European communist country with strict anti-abortion and anti-contraception laws at the time, and also the only country whose ruler was violently overthrown and killed at the end of the Cold War. Most other such countries experienced a tumultuous, but peaceful, transition. There were however other aspects of totalitarian rule that would promote violent reaction instead of peaceful transition, including a lack of associational life and legal gatherings, a more extensive system of informants and special police than any state other than East Germany, and a cult of personality built up around the supreme leader. The actual violence of the revolution can be attributed to divisions among the ruling and military/secret police and the vacuum of power that resulted. Revolutions are often observed to come in waves, and it is believed by some authors that Romania would have experienced violent revolution no matter its demographic situation.