To be honest, I'm sure character loyalty is the only reason most people put up with horrible TV shows, even though the narrative will end up scarring/disappointing them. For example, Avatar: The Legend of Korra. Many of the 'fans' of that show only stick around out of loyalty to the original series and/or some of the minor characters despite how painful the writing is, and A:TLK hasn't even done a good job of respecting the old cast.

I feel like writing a guide on how to ditch horrible fandoms using what you just said as a point because I can't count the number of times I've thought: 'Girl, you can do better. Fanfiction is what loving favourite characters who need to be treated right are for and I guarantee fanfiction will disappoint you much less than the actual series.'

I just want fandom to love itself enough to leave crappy television shows. Or at least enjoy television shows that are less problematic and give them some semblance of joy.