everyone has different conditions, so when people sell at a cheap price, there will be a reason. well, maybe you don't have an urgent need so you can still hold the assets you have, and wait for the price to be even higher.
Not only needs but they found a good coin to invest and their only option to buy these coins is selling a portion of their Bitcoin but is not that they are losing trust on Bitcoin, because Bitcoin have proven that they are here to stay for good and whatever happen Bitcoin should be the priority even after we made profit from other coins.