A lot of depends from the market. If market will start to grow they will change their opinion.
On people who do not have a permanent opinion and built the market. As soon as the market begins to grow, they change their minds, thereby pushing the market to even greater growth. They create a stir.
Partly yes. In other words, they create volatility. This allows short-term traders to make money. But most can be provoked (panic or FOMO) by the masters of market.
I think that volatility in the market is created by large players of the cryptoindustry and not by the people who come and go.