Because they are always going to depend on bitcoin, maybe you do not understand this because this is very difficult to understand if you are a newbie.
But if bitcoin drops, everybody is going to panic, and they all will sell their altcoins because they are afraid of losing everything because of a crash.
I am trying to understand why altcoings are fall. Is there any way to see altcoin prices independent from Bitcoin? If demands are get higher for an altcoin while Bitcoin falls, do you think altcoin will get more value. I am newbie and trying to understand.