A couple of quotes from the godfather of modern anarchism, Pierre Joseph Proudhon, on why populism, while sometimes necessary, is never enough.
“…because of this ignorance of the primitiveness of their instincts, of the urgency of their needs, of the impatience of their desires, the people show a preference toward summary forms of authority. The thing they are looking for is not legal guarantees, of which they do not have any idea and whose power they do not understand, they do not care for intricate mechanisms or for checks and balances for which, on their own account, they have no use, it is a boss in whose word they confide, a leader whose intentions are known to the people and who devotes himself to its interests, that they are seeking. This chief they provided with limitless authority and irresistible power. Inclined toward suspicion and calumny, but incapable of methodical discussion, they believe in nothing definite save the human will.”
“Left to themselves or led by their tribunes the masses never established anything. They have their face turned backwards; no tradition is formed among them; no orderly spirit, no idea which acquires the force of law. Of politics they understand nothing except the element of intrigue; of the art of governing, nothing except prodigality and force; of justice nothing but mere indictment; of liberty, nothing but the ability to set up idols which are smashed the next morning. The advent of democracy starts an era of retrogression which will ensure the death of the nation…”