This is a good philosophy many traders should follow it, keep your losses as small as possible while trying to maximise our profits. When it comes to trading, losses are not always lost money. As long as we are confident in a coin we can keep holding it and wait for the market to turn around. The general market risk in the crypto markets is very large, when bitcoin is falling in price than it will pull down most of the alt coins with it. As long as we make a higher profit when the prices are recovering than we are in a good position. It also can have benefits to sell coins at a loss, we won't have to pay taxes and reduce our tax liabilities in another trade. Losing is always part of trading and investment, but who is not trying and doesnt join the market has a 0% chance of making a profit.