I will assure you that Bitcoin is the main reason which make the market price of crypto and Altcoins are severely affected. This is the downside of our crypto market when we can not afford the price.
The set of Altcoins decreases in the price at that time when the bitcoin stands still. I don't think that it is worth blaming for all reductions of price of Altcoins only falling of the price for bitcoin. Much also depends on the team of developers.