There are many other cryptocurrencies which would be easier and more secure as a money laundering tool. Bitcoin is not completely anonymous and it is possible to track transaction. Bitcoin is not only about money laundering but it is also an important currency which will be widely used in the future due to its adoption and growing value.
I have the same point over this currency which is using for money laundering because this currency is related to the private key of a person but does not know who is the person and therefore people can use it for money laundering. However this is the same with other currencies that people can use other tools for money laundering, so it is up to the use and not source.