If they feel its in their best interst to move then that is their choice, the reason as to why doesn't matter, thats like saying if a person builds their own house, or buys a house they have to live there forever. Doesn't matter how a person receives a house, gift, donation, purchased on their own, rented, bartered, no one should be forced to live somewhere if they can't, don't want to live there any longer for any reason. And when selling a home making a profit is usually the goal of the end result. I doubt anyone would go into it hoping/wanting anyone to lose on a deal.
Maybe a family doesn't have all the kids living at home any longer, don't need such a large home any longer, so they want to downsize, sell the home, take the proceeds invest it in a new property that will fit their needs better and take the rest if any left over and put it towards their family's future?
Maybe the ability to maintain a home is too much for them for whatever reason, and they feel it be more responsible to sell the home, and let someone who is able to maintain it do so.
Maybe they are human and made mistakes and for financial reasons have to sell it. Whatever the reason they have to do what they feel is right for themselves and their families. Who are we to judge? and Why does it Matter?