All true, but there are times when an individual is clearly at fault, Tenerife, for instance. Likewise there are times when operating procedures are at fault and we as an industry shouldn't shy away from saying so in either case. Furthermore, reading an AAIB report is hardly second guessing the cause of an accident although this report seems remarkably short on conclusions.
In this particular case I'm not saying the pilots were neccessarily to blame. It seems to me to hinge on the 'normal procedures' the AAIB report mentions then ignores. If it is a BMI SOP to turn the radar off then one would have hoped the AAIB would have questioned the motivation behind that SOP and the CAA inspectors that approved it and then commented on the validity of the procedure. If it was not SOP then the decision to turn the radar off becomes critical, particularly as the report shows the thunderstorms were visible on radar to the following aircraft that did have its radar turned on.
So what do we learn from this report? OTB hints that relevant facts were not included but doesn't explain himself. The report itself doesn't even comment on whether or not the 'normal procedure' of turning the radar off is acceptable.