It's just depend on how we use it, for me ppersonally it helped a lot with my trading style, i always place a stop loss whenever i entered a trade because i won't waste my time holding coins that already crashed. it's just the same with a knife, people could do cut fruits with it but they also could but their fingers by doing it.
Its a literally a must stop loss will help us going back to trade even we loss some amount because of it what matters is we protect our capital to be in a huge loss. We can trade in other day or week if we want to and recover that loss a proper setting of stop loss will save our emotions and capital. Its not an evil you just need to know where to place it with a risk management.
This is exactly important! There are lot of new people start to trade but they still don't know how to use stop-loss and they believe that their trades are always correct or will go to their take profits area or target price.
Well, a lot of trading experience this that STOP LOSS is not important (especially me before when I started to trade). At the end of the day, they will realize how stop-loss is really important, especially when you are doing margin trading or those trades that have leverage.