I think I see how it happened in 1939.
The population still does not know this is happening. The left had been pushing thing for last 10 years, and people still have no idea that this is happening.
So, if people started noticing today, What will people see in 2 years, when it finally explides? They will realize not only, that they no longer live in a sane society, they will literaly see pedophilia run rampant.
And that is where the killing will be unleashed.