Well, we actually do, really. The French government refused for 30 years to have their pilots interviewed about the issue, relenting only very recently. They even deployed a cover operation to take charge of recovering the relic and mislead investigators. NATO actively impeded investigation at various points, quoting secrecy rules etc etc. The Italian military miraculously "failed" to keep proper records of their radars, and the government actively misled investigators and the public at the time.
It's now widely accepted that the Itavia 870 was downed by a NATO plane, likely French, likely engaged in some sort of anti-Lybic operation.
Yes, but I meant, with all the details, and with all the nations involved taking their own responsibilities.
Who knows, maybe in 50 years they will unveil the state secrecy and we'll know it for sure..
After more than 30 years we still don't know for sure what happened...