Equivalent pains are more powerful than equivalent gains (about twice). This leads to aversion to unnecessary risks.
Losing something you own feels worse than not even having it in the same place. Perhaps you remember the time when you lost something, when your computer broke, and compare it to all the good memories of it - due to binary thinking, of course it feels a whole lot worse - human brains also have a strong sense of nostalgia, and especially when it can find no rationalization of a silver lining, it simply feels intense pain!