I think people tend to underestimate the human nature in this case. People, regardless of what coin they own or want to buy into, need some sort of a trigger to actually start buying. In this case, Litecoin's significant gains tempted Bitcoiners to start buying too, and it's actually a welcome buying trigger. If it weren't altcoins pushing Bitcoin up, what else would?
I have the feeling that we're going through a mild altcoin season, which is quite positive for Bitcoin actually. It means more demand for Bitcoin and thus less dumps because altcoin traders need Bitcoin to trade against the 1001 different shitcoins. People prefer Binance as exchange, and shitcoins. What coin do you need to trade shitcoins on Binance without going through KYC? Bitcoin.
Perhaps that altcoins will return the favor for once and prevent Bitcoin from sinking deeper. We'll see how things go.