Ras1983

Bro, your points have too much story-telling logic to make it into D&D's sphere of thinking. The problem is they are good at adapting (which is why the first 5 seasons were good) but terrible at writing (running out of source material was a big problem). The pathetic way the NK's arc was resolved has to surely go down in story telling history as one of the worst plot endings. Hopefully GRRM has something better planned in the books.

To the people still struggling to come to terms with Dany and Grey Worm's actions, watch this documentary about the My Lai massacre in Vietnam: A lot of what is in that documentary can be applied to the actions of Dany, Grey Worm and their army. Years of pent up frustration and setbacks finally come gushing out during the battle for King's Landing in the worst way imaginable. Bloodlust is a real thing. Ample evidence provided by soldiers from many wars demonstrates that the impulse to kill and seek revenge is very difficult to control without good and strong leadership. The Jocko podcast has a great episode on this topic: Dany and Grey Worm's actions are disgusting and reprehensible but are completely believable. Dany ultimately proved herself to be an effective conquerer but a pathetic leader, as did Grey Worm. For his part, credit is due to John Snow for at least trying to stop the carnage after it started but, as others have said, he is at least complicit based on his suspicions of what Dany could be like.

BTW, the Dany mad queen theory is old. Here's a thread about it on these forums from 2011: It's definitely got precedent in the books. So yes, it totally fits in with her character

Lots of fair criticism about the writing and the various story arcs like Jaime/Cersi and Arya. But, as per Dany, it's been hinted at from very early on in the books that Dany was going to crash and burn. Perhaps the show rushed her transformation a bit, but bloodlust is a real thing and it would have been cathartic for her to go on a destructive rampage considering what her quest for the throne has cost her. She initially lost her kingdom and family, her home, her brother, Khal Drogo and their son, she was betrayed by Jorah, by the slave masters, etc etc. She lost two of her dragons for crying out loud. So she would have been running on pure emotion and adrenaline like many people would have had they been in her position. One last point: "Power tends to corrupt; absolute power corrupts absolutely". That's exactly what happened to Dany when she heard those bells ringing.

What could have been... this guy does a great job of rewriting the story to make everything a lot more satisfying!

The biggest problem isn't that Arya killed the Night King, it's that the character of the Night King was under utilised and the resolution to his arc ended up being unfulfilling given the many years of build up. There was a lot of lore that could have been incorporated into the story ahead of him being killed by Arya at a later stage, with the victory having cost the main characters a lot more than it did. For example, they could have had him win the battle of Winterfell and then either move onto KL (if he were totally focussed on destroying humanity) or the Isle of Faces (if he wanted to end his torment and reverse whatever the CotF did to him). Or they could have had the 'green men' from the Isle of Faces show up at some point to help defeat the Night King after half of Westeros had been conquered. Or the battle of Winterfell could have been a feint, with the Night King having sent the bulk of his army to KL. Or the crypts in Winterfell could have been broken open, with the dead Starks going on a murderous rampage. As it stands, years of build up have come to naught. The Night King appears to have been a silly tactician (remember, he had 8000 years to plan for this), Arya's character is going to have the legacy of having killed the Night King cheaply, and the whole White Walker threat ended up not being much of a threat to most of the realm. And finally, the whole idea that the Night King's aim was to remove human memory by eliminating the three eyed beings is just, well, kind of small minded given the many other possibilities that the writers could have chosen.