Those whose fingers begin flailing hysterically against their keyboards whenever talk turns to whether the accused are getting a raw deal in regards to rape accusations are proving to the world that they don't actually care about justice, social problems, or rape itself. It's just a reflex for self-preservation. The only "that could be me" they can process is being the one accused of rape. And therefore that is what matters to them, purely. But in much the same way you don't want to be accused of rape, you probably also don't want to be the one coming to the defense exclusively of those accused of rape. You look really gross really quickly, to everyone.
There's probably a discussion worth having about all of this but I doubt it's ever going to happen here.
Rape is the only crime for which people are proposing doing away with the presumption of innocence. It produces a unique kind of response online because it is unique in that position. I don't see how that proves people concerned about preserving the presumption of innocence are somehow betraying their malevolence. They would have the same reaction and be just as concerned if people were talking about doing away with the presumption of innocence for theft or libel, it's just that no one is proposing that.