Do you think that Calliope's claim that cherubs can only have black feelings stems from the isolating nature of the species, and the fact that the only other cherub you normally interact with is your polar opposite, rather than something biological? I doubt any cherubs had outside interaction with other species before so I think that's how Calliope came to that conclusion

It’s possibly something accepted normally by Cherubs, but as Homestuck repeats time and time again, there’s no such thing as a species or a kind of people that are always 100% predisposed towards something. Proving she’s more than what she believes Cherubs can amount to is a big part of Calliope’s whole arc.