With any group of people in life, sad things happen, and crazy things, and happy things. When you're in the public eye, it's just amplified, that's all.
Anyone can negatively criticize - it is the cheapest of all comment because it requires not a modicum of the effort that suggestion requires.
I like the idea of the documentary as a portrait. There's not a chronological beginning, middle, and end structure. You build something in the editing room that's shaped by getting to know the person and digging deeper, unpeeling the layers of them as you get to know them.