If logic were involved we wouldn't be having a discussion about removing dislikes in the first place, no? :)
Dislikes are embarrassing to, for lack of better terminology, their pet causes. Simply disabling them on certain videos or channels calls even more attention to them - so why not just remove them entirely.
The only thing surprising to me is that it took them this long.
So hence why the whole feature is pRoBlEmAtIc and must be removed :p