It has to do with fear, fear of being left out and being lonely.
The importance of loving yourself is underestimated. The lack of love of oneself creates much harm in this world.
By not loving yourself you're in a constant judgement and jealousy. Everything what the others do, you will criticize and judge.
By judging your energy goes very low and creates harm to the others. It is the source of fights, wars and misery in the world.
Judging comes out of fear. This is visible between nations, countries, companies and families.
Judging is one of the lowest energies, one can find and it comes from a deep fear of non confidence in oneself and the others.