Do you know why money laundering is a crime?

It's one of those things you hear about from time to time but it's necissarily a white collar crime and specifically a rich person's crime. Because of that I don't think many people really understand what it is or, more importantly, why it is illegal.

Do you know?
Yes, I know.
Not really.
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So far these are only partially correct answers as they seem to assume money is primarily laundered to hide that it comes from illegal drug sales. However, most of the money that is laundered is done to conceal that it comes from a business or even government entity considered to be legit in a foreign country.
Do you know why money laundering is a crime?
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