Nick
I have no personal knowledge of this case, but consider the following:
If the Captain had discontinued take off and returned to stand, yes the customers would have been delayed, yes there would have been knock on effects and yes, he would have got shouted at. No doubt he would have been subject to internal inquiries and possibly re training, not pleasant, but he probably would have kept his job.
But, apparently he didn't do any of the above.
He carried on not knowing if the aircraft had been damaged or if he'd damaged anything on the ground which could have been a hazard to a subsequent landing or departing aircraft, and that is at the least extremely unprofessional and at the worst unforgivable.
As a seasoned traveller with FRA, every other low cost airline and many other who aren't, I wouldn't have found it acceptable to be the on the next aircraft to land or take off not knowing the potential hazard left behind by this chap, and no other member of the travelling public should have to tolerate it either.