History is full of very intelligent people that are woefully ignorant on important things. The one thing about communism is that it seems to attract a lot of people that intellectually should know better, but are somehow drawn into communism as if communism is the answer for poverty, lost, unfairness, and so forth, whereas from the very inception of communism on a world stage, (e.g. the Bolsheviks) it has instead been the bastion of the bourgeois intelligentsia, not to uplift the disadvantaged, but to control them for the benefit of that bourgeois intelligentsia.
While one can certainly sympathize with anyone that wishes to uplift the downtrodden and huddle masses of the world, communism is never going to be the way to accomplish this. For instance, while it does sound wonderful that each and every citizen should be able to be accommodated with the very basic necessities of life, such as food, shelter, education, and opportunity, the communistic State only wants that to occur in actuality after they, the bourgeois intelligentsia in conjunction with the military arm of such a State, are satiated with all the material and beneficial things that they claim either that they need or our entitled too. Not too surprisingly, their satiation never is complete, their corruption never ends, and their bickering is ever constant, along with the very basic fact, that their fruits essentially come from the labor or exploitation of the underclass, which in aggregate has little incentive to accommodate them, even under the penalty of death, imprisonment, or banishment.
While it might sound enticing to actually live in the pretend world of which all are provided with the basic human rights of living, this would actually necessitate that somehow the State would be capable of successfully divvying up the resources to accomplish this. The problem is, when the mindset of communism is that there is no God, there isn't much of a real reason in a dog-eat-dog world of a zero sum society to want to give up what you have labored for to someone that has not labored for it, whether by sloth, by illness, by age, or whatnot. Instead, you will want to protect your own, against all who are trying to take from you, which may necessitate taking actions that are in direct or indirect conflict with the communistic State.
Further to the point, in order to violently take from some in order to give to others, that necessitates force, and in order for State force to be utilized effectively, that force must be controlled and managed by the State by both the whip as well as the weal. This means, in short, that the dreamlike society in which all are benign and that get along with each other, by aiding the other, helping the other, assisting the other, willing the good of the other, doesn't exist with or within communism and never will.
Anyone that truly desires harmony, sharing, and brotherly love, is to be admired, however, this is something that is absolutely consistent with Christianity but not with communism. Communism merely takes a snapshot of a utopian society and preaches that we can get there because that is what the masses want or desire, and the only thing preventing that achievement is those that have wrongfully stolen or exploited their labor and opportunity. Thereupon, communism replaces the old regime through violent overthrow and brings forth their new regime, changing the players, but never changing the game. While the words are different, the game remains the same, all are equal, so they say-- only some are more equal than others, and those some very well know it and will make sure that you know that as well.