The words "minister' and "properly trained" shouldn't be used in the same sentence.
Okay I'm just kidding I'll be serious now.
Jaswa, as a Prot, I don't know why you're saying that objective morals don't exist. The Ten Commandments aren't meant to be subjective, they're not some "goodness is what you want it to be" crap.
Krazy, you're still msising the point. The way you say it, it's as if people stumbled across the Bible, and made a personal interpretation of it (which is actually pretty much the case for most types of Protestantism, other types, such as Jaswa's type will argue that they resemble the Early Church before the Bible, despite the fact that historical evidence suggests otherwise, but that's a different story).
Your question is valid against Prots. Of all the interpretations, how do they know theirs is the right one? What makes theirs stand apart from the rest?
Caths know their interpretation because they interpretation today is exactly the same as those who put it together. The idea is that God revealed His word in a humanly intelligble way, and the Tradition was established, and it's role was to practice, preserve and spread the message.
If you were God, it'd be like you telling me your message, then me converting it into Scripture. Two thousand years later, people who comform to my interpretation would obviously be the most accurate.
Certain types of Protestantism, such as literalism, completely ignore the context the Bible was collaborated in. It's like claiming that a painting is supposed to be interpretted as X, despite the fact that we know the painter intended it to be interpretted as Y.
Then you have Jaswa's type of Protestantism, who argue that modern Catholicism has deviated away from the Early Church. The issue is, we have historical evidence showing that the modern Church holds views held by the Early Church, so Jaswa would essentially be saying that the Catholicism deviated before it even collaborated the Bible, which would invalidate the Bible.
However, where I do agree with you Krazy on the double standard is on philosophical issues such as the problem of evil. Theists will say that the potential for evil was a consequence of God bestowing free will upon humanity, and that God gave us free will because He wanted us to freely chose Him, out of love. Yet when the skeptic mentions gratuitous evil, that is, evil which appears to be pointless, the theist resorts to saying that God is unintelligible.