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 If you do it at this point, then your $2 million will increase significantly in value just before the block halving. Then you're not crazy.
In normal circumstances, you have a good point. Especially when people don't know the difference between the bottom and the top at the moment of investing. Hmmm let's see now, if this is such a sure thing, I'm guessing you're already in the process of selling your house along with everything else you own just so you're able to ride the wave to the max right?
All this to say that Bitcoin is still very much a gamble else everyone would be pouring their hard earned cents into it. If another MtGox incident so much as shows the tip of it's nose, Bitcoin value will drop before you know it.