Personally, I came into this job in order to work the traffic myself, not spend up to 50% of my time watching someone else excersise the privilages of my licence. That said, I am fully aware of the need to train and therefore willingly undertake an often difficult task.
I have NEVER felt boosted when a trainee has been 'chopped'. We will have spent many hours training this person (one student did over 500 hours before the towel was thrown in) and it just feels like a waste.
I can admit to feeling relieved when someone is chopped who just didn't have what it takes and was repeatedly and unpredictably dangerous, but it is also a great thrill to see an ab-initio trainee validate. I'm young enough to remember what that feels like and I also remember the tremendously encourageing and helpful OJTI's who got me there.
I also remember the others!!