Competition is an integral aspect of life and of evolution and is not simply cruel as it ostensibly seems

Ultimately it's all about benefiting the gene pool.

Same with sexual reproduction which on the surface seems to be a lousy way to protect one's own genes but which is good in terms of the gene pool, in terms of creating new information.

There is a need for new information to be introduced into any system, otherwise the system grows stale, calcifies and withers away.

This is part of what Reish Lakish meant that we should be thankful to the Dor Hamidbar for having blown the receiving of the Torah and having thereby lost the opportunity to live eternally. Since, if alpha males like Moshe were to still be alive in the time of Reish Lakish, what opportunity would Reish Lakish and his contemporaries have to originate new ideas?