They money could come from many sources not necessarily a violent crime. It could be payment for helping out at a friend's bar, a gift or anything else.
Discussion
it's not money laundering if there was no blood
that's what the words mean
so it's a total redefinition of the expression
when the term was coined, most likely during prohibition, there was always at least one dead person involved in the flow of money that had to be laundered
and note that CHINESE laundries were often the site of the swapping of booty for clean cash