I'd like to make another point about the videos and children; children are natural actors.
When one of my daughters was about 6 she was outside on her bike. I was watching her from the kitchen window. I always watched her (that makes me a Dad, not a stalker! lol). As children do, she fell over and started to cry. I turned and hurried to the front door, and as I saw her from the living room window, I stopped. She looked around and then stopped crying. She stood up, brushed herself off, looked around again, and then got back on her bike. At that point I went out and said something like; are you okay sweetheart? She said something like; yeah, watch me daddy! And all was fine. She wasn't faking, it probably hurt and scared her, but when she saw there was no audience she got up and went back to riding. The performance was in case there was an audience and to get her sympathy and support. Nothing wrong with that. It's what children do. Likewise, so is much of what we see in the videos.
Before SM there were family photo albums and home movies. It was for select family and friends. Most of it was natural. SM is a much different animal, open not just to select family and friends, but to everyone, anytime.