Had Enough
Isn't your statement "showing off I bet" a bit like pre-judging the accused. What was his reason for landing in the chosen location, who was handling the aircraft at the time, was any mechanical fault diagnosed etc etc etc.
As for allowing a student to crash during the first year as an instructor - I did just that during my first month but still carried on for many years as the school I was working for was run by adult minded, clear thinking people who put me through my paces immediately following the accident and put me back on instructor duties the following day. The reasons behind the decision - 1. I didn't try to make any excuses other than I took over control, or tried to take over control too late. 2. I learned a huge amount from the accident and ensured that it would never happen to me again.
I believe that provided that you are honest with yourself and others regarding the reasons behind any errors you have made, and that you do everything to learn and understand what should be done, you become a better pilot for so doing. Admittedly it is best not to have any accidents at all, but there are countless helicopter instructors out there who will no doubt be able to tell you of minor and/or major incidents and accidents which they have encountered during their time as instructors.
To summarise - Don't pre-judge somebody just because it appears that what they were doing might appear to have been foolish. Look for the real reasons behind the accident/incident. Anybody who has suffered such problems that you have mentioned need not be cast into the rubbish bin for life provided he or she has learned from the situation and doesn't try to invent excuses to cover their jacksies......