The unlimited death and misery in the world should not make you happy to be relatively better off. It should make you angry that others are experiencing it. The “glass half full” view is definitely a more pleasant way to live but there seems to be something very wrong about it.
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Perhaps you could take the bitter "I hate you because you have more" approach. Oh wait. You already have
The unlimited death and misery wealth and prosperity in the world should not make you happy mad to be relatively better worse off. It should make you angry happy that others are experiencing it.