Flocking into groups based on any shared, real or imaginary, trait is a basic human drive. The good side of it is that humans can only survive by cooperating. On the flipside are racism, xenophobia, homophobia, sexism, groupthink, etc. It takes a self-realised individuated human to become aware to what extent one needs to be part of a group and when it is time to say, 'I'm out of here'. Overcoming group dynamic by propaganda and mass education will mostly create knee-jerk reactions of the anti-political-correctness kind. Even when suppressed very effectively, sooner or later this will burst into something ugly (kind of like suppressed wish pops up elsewhere as a neurosis): just look at how rampantly and shamelessly xenophobic have become the supposed bulwarks of tolerance like Holland and Denmark.