It's an interesting issue, though probably only of relevance to those who do hard physical work or intense exercise.  I would not doubt that a high omega 6 PUFA diet is considerably less dangerous for those who do such things, assuming that the diet is "good" in all other ways.  It's not a risk I'd want to take.  In any case, AA seems to speed up the healing process, which leads to things like scars, but the internal scars of things like weight lifting are what those who lift weight want, at least in terms of short term results.  Have you looked to see if there are studies on the overall mortality of those who do intense exercise versus the general public?  I did see a study about how certain kinds of exercise do damage to a particular part of the heart (one of the valves, I think), and there are also studies of the oxidative stress generated (you could probably find these on pubmed.com with a quick search).