It seems to me that for all the fun they were having a little risk was worth the fun. Most free flight planes float pretty slow on the way down. There is always the danger that they will hit some one on the launch tho. I have been to the Sam Champs free flight event and seen planes fly right back into the crowd and even fly behind the flyers. But I have never seen anyone hurt. Amazing.
I was flying control line old time stunt at the Sam Champs in Muncie a few years ago, and a free flight plane drifted into the Speed cage where we were flying, and sailed around in inside the cage and landed on the outside of the circle but inside the fence. It could have been an accident, but it did not happen. If we make safety the top priority, we will soon not have a hobby.
If reminds me why I retired early. Our safety department was the fastest growing of all, and much of it was government intervention. It was getting to the place that a 30 minute job was taking an hour and a half just to meet all the regs. I had been doing the same thing for 25 years using common sense without an accident. When you are working around 2400 volt equipment that is controlling 1400 pounds of pressure on gasoline, you just do things right or not. When the EPA got done with me I had to wear so much safety equipment, I could hardly do the job.
Safety is important, but going to extreme just ruins what we started out to do. Of course, we always have guys with to much money and no skill flying 50 pound R/C planes that do scare me. I tend to get behind my van when they fly and hope it is enough to shield me when they crash.
Anyway, I did enjoy the video. Lots of activity and people having lots of fun flying an spectating. I did not see anyone crying.