I guess he didn't read the journals... JA had problems years and years before she even knew TA and if you add in the anger examples that were also recorded by her in her journals and again referenced in that long email to TA(damages to her apt in Monterey that her damage deposit was able to cover, kicking in walls, breaking things, etc. how destructive she said her anger was), then it's not a hard leap to see that it had everything to do with JA and although she may not have been happy at the time of any of these "incidents", as an adult she was and is culpable for each and every one of them imo.
Vol.2, P.35, Oct.26/07:
"I spoke w/Matt McCartney for the first time in 3 months. He's thoroughly convinced I should commit myself. I don't think I need to do anything that drastic. I don't need to be on suicide watch. But I haven't felt this broken since Sarah & Cindy cut me down in everyway they could-right before Bobby did the same for the zillionth, yet not the last, time. That was in 1998. Well, actually, I've been down so low before during 2 other occasions in addition to the one mentioned above, and it's strange, now that I have a testimony of the gospel, why have I only recently begun to consider suicide like it's some kind of option for me?"
Vol.4, P.44, Feb.7/08:
"In fact, I was feeling downright depressed. I remember waking up in my bed in Palm Desert, and having that same similar feeling weighing upon me. So I can't really attach my depression to any one person or circumstance. I can even go back further to Monterey, in my little apartment off of David Ave, and I was depressed then, too. The only thing that motivated me to clean my quarters was if I was expecting Darryl & Jack, or if Mr. Meazell said he was going to drop by for maintenance purposes."