I mean, who can you trust better (or distrust better) than yourself? At least on my end I know if there were two of me I'd probably get along like a house on fire and be powerful (maybe/likely incl. selfcest eventually simply because we'd consider ourselves cool and doing cool things cool ie. a sort of circle logic, if powerful enough). I'd definitely be encouraging me to do things (mostly/overwhelmingly non-sexual and more about getting my shit together).
On the other hand, I wouldn't want to inflict myself with being myself. There's that, though maybe a myself empowered by the existence of a second self would be comfy enough to justify it or even more than that.
...ok, maybe I've thought about this (not for primarily selfcest reasons) a lot. I distrust myself and all but if there were two of me? I'd really be killing it, or at least I think I would...
Heya!