I hope my comments didn't give the impression that I was suggesting long winded arguments, debates or other waffle. Telling someone on approach that the runway is occupied isn't an argument or debate. Nor is telling them the implications of continuing the approach when it's obvious the runway is unlikely to be vacated in time for them to land.
I reckon your training department is making a very big call by saying, in effect, that what could happen if old mate in Jizzler 700 gets discombobulated on approach is likely to be worse than him carrying out a stable approach, landing and collision with your aircraft. A very big call.