Crypto markets vs. stock markets

Everyone says cryptocurrency ist decentral, independent and don't listen to extern influences. But why are stock markets and cryptomarkets falling down today in the same way?

Maybe Cryptoworld isn't that independent as mentionend? Fact is, that the charts are nearly the same with same ups and downs. Really strange. I've seen that a month ago in the same way. Maybe someone is trying how the market works an can be manipulated? Last time a little bit, this month a bit more?