I don't understand the question. Bitcoin's aim was to be international electronic cash. People use actual cash for money laundering. Why wouldn't they use electronic cash?
I think your mistake stems from holding too tightly to the term "cash" used in the original Bitcoin paper.
>People use actual cash for money laundering. Why wouldn't they use electronic cash?
I'll help you to the conclusion without googling. Actual cash is not electronic, and thus tracing efforts are much harder. Electronic cash can be traced near instantly.
I really don't see why you had to have this PA tone on your comment? Could you elaborate more on your stance?
If you're interested in learning more, I'd suggest starting with Google: https://www.google.com/search?q=bitcoin+money+laundering