I have been in aviation for more than 50 years. I was always taught, and I have always taught my students in turn, that if you drop a bollock in aviation then you should immediately own up to said bollock and so prevent, hopefully, one of your fellow aviators from dropping the same bollock.
This chap went off the prepared surface and put a mainwheel in the grass. He managed to get the aircraft out again and then went flying.
That is where most of us would have a problem with his decision-making process. He should, of course, have either sat tight in the grass or taxiied back in for a check of the offending gear.
So, I am forced to ask a couple of questions. Did he actually know that he had put a couple of wheels over the edge? Maybe, not?
If it was known on the flight deck that they had put a set of tyres over the edge, did the F/O also go along with the decision to go flying without a gear inspection being carried out first?