Sure the beam in the air is ok to look at, but when most people are burning they are doing so up close and need to be wearing laser safety glasses, if you have a beam set up in a foggy/smoky room safely that's ok to view the beam in most cases.
Now when we have 25 watt beams and thick fog the glow in front of our faces may exceed maximum safe exposure, but that's not what I was saying.
The point is this: I wear my safety glasses while burning, so I don't get to see the beam until the video, do you understand what I meant now?
To make my thought even more transparent, I enjoy seeing the beam do it's work, and that I can only watch later on recorded video.