Of course Bitcoin isn't safe, you'd be crazy to liquidate your assets and dump the money into Bitcoin. Just ask yourself how you would feel if you wake up one morning only to find that your 2 mil is now worth 700k 
However if you're operating an illegal and highly profitable business then funneling your profits into Bitcoin is not such a bad idea, the government doesn't yet have the proper system in place to deal with that type of money laundering 
However if you're operating an illegal and highly profitable business then funneling your profits into Bitcoin is not such a bad idea, the government doesn't yet have the proper system in place to deal with that type of money laundering The governments might not have such a system to deal with bitcoin money laundering, but if it wants, it will catch you.
Obviously, like it happened to silk road but OP is asking about safety in terms of stability which we all know is very low. Bitcoin has the possibility of becoming one of the most popular currencies in the world but can also fall down and be at 0$ the volatility is just too high at this moment to know which one will happen.