most of us go through more happy things and less unhappy things when we were young,
as we grow older at abt the age of 18, we will go through more unhappy things than happy things,
so after the age of 18 , we will go through more and more unhappy things and lesser happy things,

so to form a simple equation ,

live longer = more unhappy less happy
live shorter= more happy less unhappy

when people die they dun need to go through any unhappy things which is a happy thing
so die earlier = happy thing
so we can conclude that since life is so meaningless and we are only living to die, why not be happy and die earlier