There's no excuse for it, but it happens in all forms of aviation i'm afraid, the gliding club i used to fly from used to have a "hall of shame" of pictures of light aircraft flying straight over the top well below 2000' when winch launching was in progress and i have retrieved gliders from fields with an irate farmer standing by still upset by the damage a hot air baloon did to his crops the previous week. The retrieve crew had done nothing to minimise the crop damage in his opinion.
I even saw a facebook post from a local gliding club recently complaining about a single red arrow flying at less than 1000' along their downwind leg... Don't think they got a call from him....