Capitalism can be inhumane, especially if it is not controlled by democracy.
Communism is always inhumane. It cannot be established democratically, it cannot be run democratically. It will always end in misery, poverty and death.
By definition, capitalism is inhumane. Even if you are worried about the market looking unkindly on your accural of capital, you're doing so in a fashion that prioritizes their perception rather than actual virtue.
You are right that democracy can reign capitalism's amoralism in, but so can any other form of government. I don't see why the same can't be said for communism, beyond the standard "it hasn't happened before".
You mean: It has never happened once, no matter how often tried. How many communist experiments, how many ruined lives will it take until you and your kind finally get it? But I know the answer already ...