Fer fuggsake pal, do you not know about aviaton accident reports? Results are generally accepted under the burden of "beyond reasonable doubt".
No report ever claims to know for certain - indeed this whole business revolves around the impossibility of guaranteed proof. Why do some people require 100% proof to exonerate the pilots from GN yet demand the same to disprove the obvious in the other direction? How about a little (100%) continuity in logic too?
What do you suggest happened? Alien intervention? Meteorites? Ouija board? Got 100% proof then?
Heavens above! Get real. Sadly people sometimes fly into cumulo granitus. It happens. Best to recognise it though and not do the ostrich thing, that helps no one.
And lets keep asking the RAF establishment "why" to ensure daft operational taskings like this never happen again.