Bravo! I agree with every word you wrote. I too feel like people are trying to make excuses for SS, and grasping at any far-fetched scenario that might explain her behavior and that dismisses her of any responsibility, i.e., head injury, foul play, a 3rd party being involved, mental illness, etc. I think the head injury is pretty unlikely - there was no real damage to her car other than that scrape from her possibly side swiping that wooden pole on her way down to the beach. Also, I know Olympia and Silverdale are 'small towns' and people are more friendly and trusting, but I feel SS knocking on the Williams' door after dark, barefoot, and expecting them to feed her son was irresponsible and just plain unsafe. Of course, the Williams seem like very good people, but how was she to know that? Because they had a Christian sticker on their car? She was irresponsible and put herself and more importantly her son at unnecessary risk that night, going beyond just her consumption of alcohol. I don't know if SS was that trusting and naive 'normally', or if the alcohol caused her to be too trusting and lose her inhibitions.
IMO, we need to follow the evidence. Past CPS investigations -> charges of neglect -> past history of alcoholism -> fiance claiming a recent relapse -> video of her buying a huge jug of wine -> jug of wine found half empty on beach -> disoriented, unsafe and nonsensical behavior all point to one person being at fault here: an intoxicated SS.