Alright, this isn't going to be my most coherent of posts, on account of crappy sleep cycle issues. If any of this comes across as insulting, please do not take it as such, that's just me being shit at writing properly at the moment.
But before getting into some of the responses and theories put forth already, let me add a few other ideas that were bandied about elsewhere.
Hypothesis: Homura doesn't want anything to get out that would lead Madoka to be attached to her. The potentialbomb is so bad for Homura partially because it means that she's attached Madoka to herself on a fundamental level and that she'll never be able to undo it. Homura is an orphan, raised thinking she was an unwanted leech, draining the good from people. Potentialbomb applies similar emotional-logic to her connection to Madoka?
Another possible take is "Homura doesn't realize she's not time-travelling, potentialbomb causes her to realize she isn't"
Anyway, back to what's been brought up here:
I mean...
I read Kaizuki's thing. And I still don't get it?
How is Homura making anything worse?
Madoka is alive now, and Sabrina exists now. Neither of those things were true when she made her wish. Where is this "net minus" thing coming from?
I think that
this is a strong possibility for the fundamental disconnect. Homura categorically cannot accept Madoka making a wish as being a good thing, because every wish made is another time that she failed to uphold her promise, another time Madoka was doomed to a nightmare of suffering.
Keep in mind, Homura's wish wasn't to "make things better", her wish was "I want to redo my first encounter with Kaname-san. But this time, instead of her protecting me, I want to become strong enough to protect her!"
It's possible that Madoka's wish resulting in things being fixed by Sabrina
catastrophically undermines that, because it meant that, in effect,
Madoka had to save herself. Homura will have failed in her promise, and failed her
wish.
(It's
also possible that Homura
won't respond the same way to the potentialbomb in PMAS, that rather than rapidly giving in to despair on failing to defeat Walpurgisnacht again, she suffers wish-rejection.)
That's fair because you're being rational. Homura is not
You know, I'm not at all convinced she
is being irrational. If we
must accept the multiverse crap, then if Homura doesn't loop, the Madoka in the next timeline has fairly low potential and could reasonably
not be contracted due to the variables between worlds. But if she
does loop, then that Madoka will have enormous potential and thus be
guaranteed to be caught up in magical girl horrors... and then either die or turn into a humanity-destroying superwitch. On both a personal
and a general level, the outcome of her continuing to loop would be bad. Now, with our privileged outside-view, knowing that Madoka can
completely wreck reality's face, we know that there's results that are better at a general level, but even with that, on a personal level? Sabrina, or the Law of Cycles, don't change the fundamental issue there -- that Homura failed in her wish and failed in her promise, so rather than her helping, she's just tagging along, still the same worthless leech she's always been.
