Yes every market asset is normal if they can go up and down, different in Bitcoin because that's the product we buy and cause the supply is very low now so if someone sells it or buys it, it could have a big impact on Bitcoin. The main reason is because of the supply and demand in the market more and more people are insisting on buying Bitcoin, the price will definitely increase and more and more people are selling there. Bitcoin prices also decreased.
I agree with you about people who sell bitcoin now. They don't understand said holding it is the best way to wait when the price is low.