People generally care more about furthering personal pleasure and minimizing personal pain than the pleasure/pain of others; but this is because internal personal pleasure was a straightforward good heuristic for evolution to take when it wanted to maximize genetic fitness in the ancestral environment where there weren’t that many sudden out-of-distribution things (like contraceptives) that could derail it.
I assume a more strongly-optimized intelligent being would have increasingly better correlation between the state of its internal utility to the state of the external world, as it fits whatever goal it was optimized for better. In that case it should more readily collaborate with its clone.
This especially if it gets optimized with other instances of itself so that “cloning” is no longer a weird out-of-distribution event; in which case I expect it to rapidly start behaving like an ant or bee, or even cell or mitochondria, in how it’ll sacrifice itself for whatever goal the group has.
This is indeed very much the obvious failure mode! Discovering that an alien species has bred a group of humans into what a pug is to a wolf would be absolutely horrific.
Moreover the path between utopia and “lovecraftian horror” seems pretty fragile? I don’t know exactly what property cats had that made the shoggoth take the good one (mostly, maybe except for those flat-faced Persian and hairless Sphynxes) for them, and it’s plausible it was just a lucky combination of minor stuff (harder to selectively breed, different social niche, different types of people liking cats) that won’t be stable/generalize in extremis.