...I may be gloomydoomdoom sometimes, but I only disparage life's value because what there is to value about life is in short supply. Therefore, if one is not around for long, they do not have enough time to experience those things which are truly valuable about life but sadly in short supply. Or, if they are ignorant, they will not learn why these experiences must be appreciated.

That's kind of one reason I don't like emo people, they go on and on whining about life being worthless and what not, but they don't even understand any original incentive for this reasoning as acknowledged by its originators, the people who understood why precisely factors of life might lack value.