yes, by manipulating public emotions, spreading FUD, rumors - any big group or consortium can manipulate the prices a little fr a while.
This is true. But then it is not directly. Controlling bitcoin or the price of it directly is somewhat not possible but indirect deeds can probably effect. Just like what have stated above. We can say that those people who are doing it does not believe in bitcoin or they are the people with weak beart. Spreading badnews for their sake.