As one would hate fascism or any other radical idea. Communism, socialism, fascism, and even religious extremism all stem from the same issue- ignorance. That is something that can never be weeded out. It's important to know how these ideas start, the conditions in which they form, and how to prevent them from occurring.
Take the Russian Revolution. Tsar Nicholas II was a terrible man not because of cruelty or evil, but because of his indecisiveness and weakness. He let millions of his own citizens die because of famine and poorly planned military operations. The people wanted blood, and so they had their blood. The trouble is that ignorance took dominance once again in the form of communism. An even crueler leader killed even more people and did more damage than the Tsar ever did.
The people are the idea. An organization that follows a doctrine is essentially the definition of that idea. They carry the torch of ignorance. Call it fixation if you want, call it blind hatred, use every term you wish. You can't just give an ignorant person a hug and let them be. Sometimes, as terrible as it is, we must hate, we must kill, and we must end violent radicals before they end the lives of honest people.
Anyways, I stress again that in its initial days, communism was synonymous with anarchy. Rest assured, it's just as terrible as authoritarian communism, and it's still the very same idea fundamentally. For those who believe that they're different, yes, maybe the better term to use for the Followers would be 'anarcho-syndicalists'.