I dont see the Dalai Lama's statement as irrational!The "natural law" theory in ethics has been supported by geniuses such as Aristotle and Thomas Aquinas so calling it irrational is a bit harsh in my opinion. The most popular theory in ethics among westerners these days is "consequentialism" but that does not make other theories such as "deontological ethics" or "natural law" absurd in my opinion!!!