Do you think of them as 'sharp, incisive' arguments only when you use them? The fact that they can be equally applied to you with just as much validity escapes you?
"I guess when you have no original thoughts yourself but are intellectually stuck back in the 11th Century it is all you CAN do."
Actually, all the quotes I used are from the 20th Century. You didn't know that?
Originality counts for a lot. Aping someones comments was considered really clever back in third grade; some of us grew up since then and now rely upon original material for our rhetorical points rather than the equivalent of “I know what you are but what am I?”.