Good luck building up a coalition of people who will cooperate with you.
And worse: good luck politically defeating those who are smart enough to use basic psychology to coordinate the masses. Its not evil to do so, its just practicality. We know how people act and how they think. Its not so hard to then use psychology and sociology to build up our own coalitions.
As Terry Pratchett wrote in The Hogfather : We tell little likes like Santa Clause because we're training children to believe in the big lies like Truth and Justice. And only when we all believe in that stuff can it possibly work. "We're the best country in the world" is part of that, its a little lie that helps smooth over problems and helps us work together. And in my experience, its effective at it.