So basically because of btc fuckups alt coins are getting dragged down the drain aswell, even if they are very promising. USD parity is better so they can stand on their own and not depend on btc.
Yes, pretty much all alt-coins (of significant market cap) are tied to/strongly correlated to BTC.
There are one or two notable exceptions. XPR, for example, while still correlated, is not as strongly coupled as the others.