Oh, I thought I was talking to someone smart, not someone who would make such a reflexive and unthinking statement like:
Ethics are meaningless because there is no way of establishing that one ethical system is better than another.
Because a smart person would realize that the most important discussions are those which may not result in simple "establishment" of the superiority of one claim, concept or valuation over another.
Also, Heidegger's viewpoint isn't an "opinion." There are more categories of utterance than just "fact" and "opinion," by a multitude. And clearly, if I refer to Heidegger, it implies that I find his viewpoint compelling.
But I'm sorry for wasting our time. Please, go back to your world of simple formulaic thinking.