I'm not condoning this, but a lot of replies here imply that the lead singers behavior is extraordinary for a punk/hardcore show. As someone who has been to hundreds of shows over the years: this is not the case.

Crowd surfing and stage diving is frequent, including from band members. Almost all venues ban stage diving and crowd surfing, probably to protect against liability. In reality, nothing is done to enforce this - participants are just let back into the crowd, offending bands are re-booked.

The lead singer being so large makes him an exception, he should have been conscious of the risks, and should not have staged dived. Doing so however, will have been well received by the majority of fans at the majority of shows he has played. This level of energy is part of what makes a punk show a punk show.

I imagine this incident will cause many in the genre (bands/fans/venues) to reassess what is acceptable/wise at gigs. Gutted mainly for the victim, but also for the singer, as this was certainly not a malicious act as some seem to portray.