Both Tiger_Mate & 4Greens are right in equal measure. Rarely is an accident caused by a single failure of person or machine, but in order to learn the appropriate lessons we must correctly identify the main causes.
The B52 accident was not just attributable to the poor flying discipline of the pilot in command, but also to a shockingly inefficient supervisory chain which failed to act on multiple red flags raised by many people.
Equally, trying to disguise human error by attempting to reduce all accidents to design flaws and irrelevant maintenance issues will do nothing to reduce accident rates and in many cases would simply serve to obscure the true cause and therefore dilute the lesson that needs to be learnt.
Personally, I think the industry, both military and commercial, has a pretty good track record of identifying problems, highlighting lessons and communicating them to the people that matter - pilots and engineers. A lot of what gets highlighted in the media is just noise.