You pay attention. DASH, Monero and Zcash have been listed in the top 3 crimes altcoin commonly used.
According to Jarek Jacubchek, a security expert at Europol, while Monero uses non-transparent bockchain technology, DASH arranges transactions in a way that no third party monitors the cash flow. . Zcash has special security that prevents access to and control over illegal sources.
Maybe this price of 3 coin will down people to monitor the situation offline.
This thing is also happening in some countries with predominant money. It's the same thing, they are just using this digital currency to take some advantages to do crimes. There are places that is called black market where you can have hidden transactions and can buy some things for crimes. Even bitcoin is used also, do you think the value of bitcoin becomes low? it gives no effect at all. Popularity of bitcoin becomes big because of many investors in the world not in crimes. It's a normal thing for some but still it's dangerous for having this system, it's makes me concern about what will happen next in monero.