the upcoming volatility and uncertainty seems pretty scary to me personally. even if the long-term prospects seem promising it's hard not to consider taking some profits now and attempting to buy back later if there's a correction
Securing some of your profits is part of the game and very healthy for your position in Bitcoin, especially when the price starts peaking at record highs. It will allow you to buy back your coins at lower levels if the price happens to go down. And if the price doesn't go down, you'll continue to benefit from the price that rushes up further. That being said, solid holders don't care about the price tanking or pumping -- this is more something that effects the less experienced people.