The problem with multi lingual R/T is just the opposite : it is not dangerous and has not cost many lives as you say. If it had, then it would be easy to argue in the ICAO council everytime the subject comes on the table.
OK I'm confused with this comment..........
You are saying multi-lingual ATC is a good thing? or at the very least...not an impediment to situational awareness and flight safety???? or that you don't feel it increases/decreases the chances of an incident based upon its uses and limitations?
Please clarify...