Such people just search for fast gains.
If they sell their BTC for such reasons - it's well-deserved they don't get what they intend to by pouring their value into something different and more risky.
It could be just a moment then they buy back and also that is their right because they already have the asset but what is certain is that they also have special considerations of course. I personally see this as reasonable because no matter how much they sell to the market there are still quite a lot of people who are ready and still willing to buy back this coin happily.