I also... out of courtesy... will use a local language to say Good morning....the essential information following should be there for all to understand...
Citing the Tenerife disaster as an example does you no credit whatsoever....the problem was partly that the contollers English was so poor that the pilots were having trouble understanding him..A similar problem arose with a Dan Air aircraft in the Canary Islands some years back resulting in a collision with high ground. To argue that ' things go wrong anyway' is a fatuous argument... Being at the front of the aircraft it's in our interests to try to ensure that things don't go wrong.
On a stinking wet and dismal night watching businessmen climbing aboard the aircraft after a hard day I often think of the families waiting for them at home.....It's up to us to get them there...So go away and campaign all you like... the language of the air is English...until it changes, use it.
I'm beginning to see the value of Airline Psychometric tests..