“It is in connection with the deliberate effort of the skillful demagogue to weld together a closely coherent and homogeneous body of supporters that the third and perhaps most important negative element of selection enters. It seems to be almost a law of human nature that it is easier for people to agree on a negative program—on the hatred of an enemy, on the envy of those better off— than on any positive task. The contrast between the “we” and the “they,” the common fight against those outside the group, seems to be an essential ingredient in any creed which will solidly knit together a group for common action. It is consequently always employed by those who seek, not merely support of a policy, but the unreserved allegiance of huge masses. From their point of view it has the great advantage of leaving them greater freedom of action than almost any positive program. The enemy, whether he be internal, like the “Jew” or the “kulak,” or external, seems to be an indispensable requisite in the armory of a totalitarian leader.”
Hayek, F. A.. The Road to Serfdom: Text and Documents–The Definitive Edition: Text and Documents–The Definitive Edition (The Collected Works of F. A. Hayek, Volume 2) (pp. 160-161). University of Chicago Press. Kindle Edition.