Saying that the world is full of tradeoffs and saying that there is nothing completely true are two very different things. For instance, I never said and in fact disagree with the latter.

I will never forgive the postmodernists and naturalistic junkies, because they've basically sabotaged the ability to have a discussion about the relevance of empirical evidence, let alone discussing reasonable courses of action in the absence of it (hint: a diversity of approaches will actually provide you with the missing data.) It's funny, though, I bet if I mentioned the data linking chlorination to bladder cancer you would be quick to dispute it, perhaps even using analogies similar to the ones I resorted to. And of course, with the quote you use to mock my approach you conveniently discard the justification with ellipses.

So would I be irrational to swim in the local pond? Are all of the kids and parents irrational for doing so? How do you think we should best address such irrationality?