Look, I think communism sounds great, but the problem is that it simply doesn't work in practice. In other words, it has been tried, it just doesn't work.

To see why, you can categorize the forms of government as so:

    - Monarchy/Dictatorship: Power in the hands of one, one person is authority
    - Oligarchy/Republic: Power in the hands of a few, aristocrats are authority
    - Democracy: Power in the hands of many, majority is authority
    - Communism/Anarchy: Power in everyone's hands, everyone is equal in authority

In reality, society only works when there's a power hierarchy; it's the natural order of things. The more you equally distribute power amongst people, the more dysfunctional/less orderly/more bureaucratic society becomes.

In particular, notice all the forms of government (except for communism) has a way to settle disputes without resorting to violence. For example, in Democracy, you settle disputes by voting, where the majority wins, and the rest don't get their way. This ability to settle disputes without violence, is what makes us civil and what makes society a society. Without it (such as with communism), you are in complete anarchy, where raw might/ability (eg successful violence/persuasion) is the only thing there is left to settle disputes. Thus, those who wield it typically end up becoming the "authority", and is why over time, communism/anarchy will naturally change into one of the other forms of government.