I don't believe in "natural predisposition." I believe our bodies are controlled by our minds, and what our minds do depends on what ideas they contain, and that we learn all our ideas from people and books etc, we are not born with any. Since we are not born with any innate ideas, "natural predisposition" is BS.
I also believe that our moral perspective is a function of our ideas, not just our factual perspective. One person can be raised on Jane Austin and another on Mein Kampf. And also, there is no reason to believe that ideas would be uniformly distributed across the world. Why would they be? There are myriad influences, historical and otherwise why people in one part of the world might believe things different to another part. If one village learns something, some new scientific theory, but there is a big mountain between them and the next village, conceivably that idea might never be transmitted.
So given all this (that morality is a function of ideas, and that ideas are not evenly distributed geographically), there is absolutely a valid argument to say that an entire continent of people might have different morals.
In no way are different morals the same thing as no morals. You can take two people and there will be something that each has a different take on regarding right and wrong, but that's not what is being said here. What is clearly being thrown around is that there are nations, a continent, of people whose have no moral compass, people who lack a conscience, and whom all feel the exact same way about it.
Can you honestly say that everyone on your continent hold the exact same values? Of course you can't, and you have done so with Asia which is made up of a vary diverse number of cultures.
I've been around the world and quite frankly I'm always happy to get back to the US. It's not because I think other cultures are wrong but they are too different for me to really feel at home in. I also really like American food, especially the Americanized versions of Chinese and Italian. No one is saying you have to enjoy other cultures but certainly can't be considered objective or fair when you claim that they are wrong and you are right with your "bad by education" hypothesis above.
PS: Have you ever downloaded an illegal song, video, or software in your life? If not, do you others that have? If so, were they all Asian?