In politics, or any sort of critical thought:
For every thesis put forth, there will arise an antithesis. From the agreement or conflicit resolution of those two, will arise the new thesis. And etc...etc...

The most notable exercising of this theory came in communist China, during the 1960's, commonly referred to as the people's revolution. Mao organgized and put forth a band of his fellow communist who appeared to be contesting his regime and ideas.. In esscense, the leaders and instigators were his lackies and fellow commardes.
the common people took to the street to purify their society, to new ideas. Little did they know, they were led and approved of exterminating about twenty million of Mao's enemies.
Mao took conflicit resolutiohn to a new level.

Bottom line, it works well in a free society, but watch your ass, in China.