Bitcoin was not created to be used on laundering ill-gotten money or the money taken from criminal activities...that is not the main design of Bitcoin. But since it is also a currency the government could never post a police on everyone...anybody can use Bitcoin for whatever purpose one has in mind whether they be legal or illegal. The problem is that since Bitcoin is still new or something that is novel, it can easily be highlighted and so we always hear this point in the mainstream media. Please note that any currency digital or not (fiat paper money) can also be utilized for criminal activities. In fact, I have a report that the biggest transactions for criminals are still conducted in real cash (though Bitcoin can be more attractive for them).