Communism FORCES rules upon people. Without capitalism as an economic system also immersed with it then it requires central planning. Capitalism does not require central planning so the comparison is a poor one.
So if you want to force a system upon people that requires central planning to work then I am stating... "Sure, if I get to be the central planner." Why do I state this? Because, I know that the proponents of communism and socialism would NOT want me as a central planner. This implies that they have people in mind that they will imbue with the power to force their planning upon me. I will not accept this.
I actually don't expect you to accept me as the central planner either but if you demand socialism or communism then the only way I'd agree is if I get to be the central planner. :P
You cannot say the same thing about free market capitalism. There is no adequate comparison. The economic system of free market deals with supply/demand and changes innately without requiring a central planner. In fact the WOES people try to push upon it don't actually exist until government becomes involved. At that point it is no longer a free market. If you don't understand the difference then I can't magically make you understand.
RE: My new thought on something to say to pro-communist people...