There is absolutely no way of knowing if the money is good or bad. If you consider every mixed_cash as bad, you would be forced to assume that the entire cryptocurrency is bad bec of how the money flows.
That's exactly what's happening, according to this page that was on the HN front page a few days ago: https://news.ycombinator.com/item?id=30224637
Millions of innocent people use cryptocurrencies. Even if you assume a currency is bad, its impractical to think that millions of people are bad.