Remember when Roman Atwood let his little kid point a 1 watt laser outside, then burned with it inside? These fools with a 600mw green might be even worse. No beam control, beam almost in face, no glasses, looking towards lasers, many people in one room. Disaster waiting to happen, and a bad influence.
https://www.youtube.com/watch?v=LDWyvCOj0Jw
https://www.youtube.com/watch?v=LDWyvCOj0Jw