We all know that maximum of the time whales make their moves to manipulate the market also we know their accumulation strategy.
You are somewhat right as the whales can move the market in Altcoins but in Bitcoin they do not hold that much power to manipulate the market. The Bitcoin market is highly volatile and many of those whales will also lose their money if they try to pump it. There is no one who can exactly predict the Bitcoin price and if those whales are long term holders then they won't get affected as Bitcoin's price will reach all time high one day.
Whales always play with the sentiments of weak hands. For example last week we saw a very volatile market and you know what whales took a lot of the Bitcoins from the market sold by the weak hands and now they gonna give them back to us at high prices.
This is the way of the market and I agree with you on this point. However, the whales have already accumulated enough Bitcoin when its price went below $16K because most of them were aware that soon Bitcoin will cross $22k mark and that event happened sooner than their estimation. The ones you're referring as weak-hands are also making profit with scalping. Everyone earns differently in crypto market, but I would only call those people week-hands who sell their Bitcoin at loss.
The point is Whales always win because they are the strong hands of the market, they use to grab each and every opportunity for the accumulation of Bitcoin. A very common piece of advice for the new ones from the seniors is the control emotions such as Fear and Greed and in my view, you can call the whales master of emotions. According the to report the recent market panic made whales more strong as the holders of Bitcoin from 100 Bitcoins to the 10K Bitcoins accumulated around 64K more Bitcoins.
That's true indeed, those who can't control their emotions in crypto-trading world will always lose because of the volatility. The greedy ones who want to get rich quick are always the ones who will sell with losses rather than getting any profits. Their greed turns into fear when they see the red candles, they want the green candles but without a proper trading plan and a well developed strategy they shouldn't even expect the green candles.