I actually very much agree, Sisyphus is really a character that people can sympathize with. The difference though, I think, is that Sisyphus was condemned to his fate for eternity by the gods – he can't do anything else about it now. From the lizard point of view however, I always imagine that like most people we are all initially born, raised, and brought up to believe in Sisyphus' struggle as our own, but then we discover that we can actually walk away at any time.
And for normies, robots, and wizards alike, that is a scary thought if Sisyphus can actually walk away at any time to do what he just wants to do, since it means Sisyphus is no longer a product of the gods but of his own doing, torturing himself on pointless matters. Celibacy is naturally one aspect of this, because the relationships that incels secretly desire is just a chain to bound them to the world instead of abandoning the notion altogether and liberating themselves to true freedom.
As far as warm-bloods ruining their own world goes, no doubt they will continue to ruin it, but I would find it hard to believe that they would actually destroy it, per se. They will make it shitty, but in their ways will never have the guts to permanently end it all – a lot like the Chinese Sisyphus, Wu Gang, who would endlessly chop branches of a tree that just grows back. Warm-bloods will quarrel over which branch to chop, but will never uproot the tree itself. https://en.wikipedia.org/wiki/Wu_Gang
Lizards on the other hand, simply sit back and enjoy the fruit of said tree from a distance, neither cutting trees or playing with boulders, just relaxing while he can.