You don't believe "whales" people manipulate markets?
The cost of trading. No exchange is zero-fee frictionless, there is order slippage and bid/ask spreads to consider.
Sure, large orders can temporarily halt an advance or pause a plunge, but the overall nature of the market doesn't change. Many people have been made poor by thinking they can take on the entire orderbook, even a smaller one like most Bitcoin exchanges.
People making up their "whale" theories about how everything is manipulated is much like the same desire to "believe" in a diety, its a mental mirage that helps them frame the chaotic nature of the world in a way that seems easier to relate to.
I don't suffer from this, because I see the market for what it is, big players and small. It is also why I know when to buy and when to sell, because my market theories aren't based on populist rumors or myths, but codified and objective observations on how markets work.
I don't mind that other people subscribe to the "whale" theory, it makes my trading just that much easier.