Some of these arguments appear cogent because they are simply stated and follow logically from the starting propositions.
I agree with spintreebob that if people don't recognize that there is more to the economic debate than capitalism vs. socialism they are necessarily starting from faulty propositions, and any argument they make no matter how valid will lead to a wrong conclusion.
Flawed premises do not make for valid arguments, bottom line. They are called deceptions, and as such are hewn down readily by attacking the flawed base.
I did not say “capitalism versus socialism”. I stated the true natures and actual namesfree market versus government-micromanaged economy. I will not hand the argument to Marx and his devotees by using their terminology.