There's nothing logical about it because debating assumes good faith from both sides in their quest for the truth. Marxists do not have that, because they do not operate in good faith. This isn't a criticism of Marxism as a set of ideas per se (though it would be deserved), but a criticism of the people who keep espouse such ideas and their quality.
These are people who will not rest before they fill every valley and flatten every hill in the name "muh equality", they will not rest before reducing everyone to the level of the yeast that they are.