Communists same energy as integrists

Communists and integrists are full of hatred for the western democratic system and would love to overthrow it by any means, or so they claim.<br><br>But in the end, they both presumably want to build a better society. They obviously know better than us, poor zombified capitalist living in a decadent, reactionary society.<br><br>So if they really are altruists wanting to build a better world, I don't understand why they don't immediately create their idyllic society, be it communist or caliphate. Why not just create a small scale version in order to show everybody how superior those societies are? It would be such a shame to deny the world their superior system simply because they don't want to create their ideal society.<br><br>I don't expect this post to be taken seriously by communists/integrists, but at least it can be a fun thought experiment for our part.