Its hardly safe for most traders in the best of times in NG, much less now.
When there is a major breakdown/blowup by a major participant, it scares other large players and they tend to wind down their exposure to avoid getting caught in someone else's stampede.
I wouldnt be surprised to see some sort of investigation into this from at least a CFTC type to maybe even some congressman , citing market interference as the reason to subpoena records. IMHO, this isnt something to be cavalier about by anyone.
And, if these guys got caught, the question regulators, and other large traders/banks etc will ask, is there someone else caught as well.