Almost all coins are still tied to the value of BTC. Many people trade based on BTC value so when BTC falls so do the altcoins and most of the time they fall even harder. Int he future the hope is that altcoins are independent of the value of BTC, but right now most people accumulate altcoins to convert back into more BTC and therefore are tied to that value. Once BTC starts to rebound so will the Alts.