Do you mean that the victim-blaming is what these people actually believe and therefore it's a form of "truth"? That we can say victim-blaming is wrong but the truth is, there's a lot of people out there who blame the victim for rape and that's something that should be acknowledged?

That's something I think I can agree with. Clearly, victim-blaming is a bigger problem than people might like to admit and while reddit represents a relatively small niche of society at large, there's clearly a lot of people sympathising with rapists and to just dismiss such comments as unproductive or unhelpful is ignoring a large problem in society.