Why ?
16 February is the Chinese new year and because many chinese now need money to spend sell their bitcoin and altcoins for now. BTC was in 80 days never been so low priced. Now the altcoins wich has enormous potential like Ethereum, Litecoin, Ripple, Bitcoin cash, cardano, Stellar etc. all are for sale !!
Wow, this is a very entertaining premise! It's believable, given the demographic of Bitcoins hodlers....Bitcoin is "the coin of the people!"
Regardless of the reason, every mainstream coin is on sale. There's been no significant news to drive down the price of everything, just profit taking and a run down from the sheep (it's typical). Things are on sale indeed, if you have cash on the sidelines consider this a buying opportunity!