No? It has nothing at all to do with the blockchain. Heck, it may even be detrimental to money laundering considering the fact that all your transactions are recorded on a public ledger.

The only reason why governments are concerned with money laundering using Bitcoins is its ease of use. Get an address, and you can send and receive money, and no one can do anything about it. It can be traced, yes, but there are ways to make that harder, and it may still be more convenient than laundering traditional money.