I agree. Acceptance can be hard for me too depending on the topic of course. In the case of GnR, I don't really know any different. This band has been slow and different from the rest since the very beginning. By the 90s I already accepted this and took them for what they are. Sometimes I wonder if I'm simply not as big of a fan as those on here who are always so frustrated and disappointed, but I don't know. I wish Axl had been more prolific as much as anyone else and that this band would handle a lot of things differently, but it's been this way for so long, and at the end of the day, I have so much more to worry about in my life than a rock n roll band, so I've accepted it a long time ago that this is how they (or should I say Axl) operates. Doesn't mean I like it, but it is what it is. I think I'm just better at accepting.
But I think you're right, for some all the bitching about something like this can simply be a coping mechanism or just a way to blow off steam from their life or whatever, but I personally think that's quite silly. But to each their own, I suppose.