The way I see this is: Although, of course, it's ALWAYS wrong to cheat on a spouse/family, GA was a person under extreme stress. Not only was his granddaughter missing and possibly dead, there are always the complications of family relationships as well. Can you imagine what kind of hell he was going through? And, again, although wrong, I think the context is important.
I don't believe GA went out seeking an affair. A person under severe stress is vulnerable and connecting with another person, especially a person who can offer some relief from that stress (not a family member) is not only often a great temptation, but also easy to "slip into" versus making clear, thought-out decisions. GA, if he did, indeed, have an affair, succumbed to a great temptation at a time when he was very vulnerable. Bad, yes, but the person on the other side is simply evil.
RC, or whoever she is, SOUGHT OUT this grieving, distraught family. She persued an affair w/ GA when he was incredibly vulnerable. This is some of the worst evil there is. That is unspeakable. I saw her testimony and believe that JA went waaaay too soft on her. I believe that many prosecutors would have brought out what she had done much more vividly to the jury, which was to purposely, premeditatively, take advantage of someone who is down simply for her own gain. Descpicable.
I have much criticism of the Anthony family for what much of their behavior seems to have been, but GA's "affair" doesn't come close to some of the worst -especially RC/KH's -or whatever in the heck she calls herself. I can think of some names much more appropriate, though.