I don't agree. You should always be able to provide a rational explanation for "why". If you can't it suggests you are arguing dogma.
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
I'd just as soon rely on appeal to authority on that one. Even if there were scientific evidence against it, I wouldn't want to live any other way. If that's dogma, so be it.