Depends on your definition of "rational", I guess. It's a considered opinion rather than just off-the-cuff, but to me it's no more a product of logical propositions than "chocolate is a better flavor than vanilla." I think the problem is people hear the word "irrational" and they think "crazy", and to me, it's just a distinction here that I'm not willing to logically defend. I don't like electric power anywhere in the drive train even though I know there's really no practical difference in terms of whether I'm being assisted in powering the bike.