Gotta say (as a non Christian) nothing wrong with Jesus' reasoning and storytelling skills. Just a case of one bad axiom I guess.
I actually replied to you ask who you were referring to, since I had no idea, but then another comment said who it was so I deleted my reply.
I clearly am never going to be able to use the word "parable" again. I'll say fable from now on, even though fables have animals in them, not humans.