Kontrolor
If you're unable to see the full picture in a given situation, then maybe you should consider another profession.
Any ATCO (including you apparently) knows that you shouldn't have two A/C on the same level, on converging courses, without monitoring them. But if you see that as the only essential factor in this catastrophy then I'm afraid I'll have to repeat my earlier opinion stating that you clearly don't know the circumstances.
If you don't agree- I don't care. Go on strike as you always do!
@ E W - very good point.
@ S A- my opinion exactly.