Autobiographies tend to appeal to the more mature reader; and I suspect Hagman will sell nicely to a reasonably predictable demographic. I doubt his endeavor was inspired as much by the Muse as the financial reality that one needs an income - even in one's seventies. I have no recollection of his working recently. This is most certainly one guy who lived life as fast and hard as he could until his liver quit - he's damned lucky to see seventy.
As this book is to be a confessional of sorts, rife with sex/drugs/rock&roll, he'll realize a comfortable return. Trust that he couldn't care less what some mental adolescent thinks or feels compelled to vent. However, some of his contemporaries may be a little concerned... It matters not "who cares?" He will dare to pen his story; ergo, he cares... and that is sufficient justification. If one still feels compelled to compose flaming retorts, redirect that unstifled angst and insecurity into a constructive journey of self awareness - write your own autobiography... (assuming, of course, one has lived long enough to be of interest) and then we'll all see "who cares"...