@stenni, without meaning to be judgmental of your choices (they're yours after all), radically dealing with a part of you out of acted out self loathing (nevermind turned against yourself instead of externalized differently), can still prove harmful in the long term.
Can still come to be haunting you in the future, in case you decide to go back or that self spontaneously re-emerges in the future, just because they're an integral part of you. Now with the memory even you turned against them, which may provide for years long issues between you two and harder integrating of experiences they hold.
Long line of personal experiences I don't feel comfortable sharing yet, with that sort of thing. I believed some of mine are danger to my survival not because they wouldn't adhere to set up rules, but because they held too much trauma and information I didn't want anyone of me to have.
Still has came to bite. They were just better in that survival thing, being hope when I saw none, even if subtler than my usual methods of dealing.
Working with what they contain, may prove more helpful in the long term, even though overwhelming in the beginnings, and feeling as if you're thrown to the past that was way unmanageable and should stay at the Pandora box forever.
Edited to add: Were they truly useless? Or just someone you couldn't find the use for? That's quite different.
Then there's always the possibility they're not entirely gone. After all, something forming in your body? Is likely to stay in your body in some form. Whether it be muscle tension, pain, headaches, intrusive flashes that aren't quite PTSD ones, distress for no apparent reason, instincts you wouldn't consider yours, tidbits of behavior you can't stand, without self to ascribe them to. Spill over of something a person held relatively contained.