Hopefully this wasn't directed at me
. But to answer your question: I generally don't advocate jumping in and out of a stock because it's difficult for most people to time the move correctly. In my experience, chasing is generally a losing proposition. If you can do it and understand the risk, then more power to you.
My concern is that some people may have purchased shares when they did not understand the volatility or the risk involved. This is not an investment that one should stake critical money on, or go "all in". Based on what I'm reading ("sky is falling" type stuff), there are clearly many people that have overestimated their risk tolerance.