Well, since war couldnt do it, they have created an ideological shift through indictrination and manipulation in our schools, universities and colleges, advertising, print, radio, tv, and film, and using scare tactics in pretty much every facet of our lives.
Now those very indoctrinated and manipulated people are getting into power positions in the executive, legislative, and judicial systems of our governments.
Much like some water spilled on your floor does no damage if you clean it up, but a nice steady slow drip will completely destroy the wood in your home over time. Water will always find a way, much like the evil in man, so attention to detail and due dilligence is required by every citizen to protect the very freedoms they believe they enjoy. Remove apathy and disinterest and you have a constitutional republic again.
For thousands of years, Man has not changed. All that has changed is knowledge. Man is just as good and bad as he was thousands of years ago.