Hi Jeramy,
I can identify with what you saw and it is painful to watch. I have recently been shunned by my family for associating with a relative who was disfellowshipped a long time ago but that lead a clean and upstanding life even though he's not a JW, which many seem to think is an impossibility. It only takes one act outside the bounds of what they set for you and boom, you're dead to them. They view people as throwaway objects, even when those ones want to come back.
Jeramy, I know from some pm's that you highly value your "family" of brothers and sisters. I would advise you to take a few months to get past this before making a decision that would cut you off completely from people that you seemed to hold dear. Your "family" is highly dysfunctional in areas, and although for me that dysfunction leads me to stay away from the toxicity, maybe for you it isn't as toxic and it gives something to you even if you aren't a staunch JW supporter anymore. I've mulled over disassociation as well, and honestly don't have anything to lose at this point that would affect me today, but I look down the line toward the future and know that if someday down the road a family member were to awaken somewhat that disassociation might be a hindrance to them reaching out. So, you have to decide if you want to put that wall up. Once it is up it can't be taken down easily. You can't un-ring a bell. Once it's done, it's done.
I wish you peace, though I know it is hard to find when faith (whether in God, a religion, or certain people) gets shattered.