There seems to be a bit of "bigotry of low expectations" at play here.
Just because someone is disabled doesn't mean we shouldn't hold them to account for their criminal wrongdoings. If AG is so disabled that she's incapable of controlling her own behaviour and as some have tried to suggest her own movements, she shouldn't have been allowed out without a chaperone.
If she's been deemed fit to be independently out and about on her own, then she must have some control over herself, mustn't she? You can't have it both ways.
I highly doubt this is the first time she's behaved in an aggressive manner towards other people. It's just the first notable time because someone got killed because of her actions. Her actions resulted in the death of a 78-year old woman who had contributed greatly to her community in her life. She should pay the price for that.
How would all of the people leaping to AG's defence feel if it was your mother who was killed?
As for the question over the shared space, it's irrelevant. It really has little bearing on the case. It looks like it was a shared space but even if it wasn't-it doesn't justify AG's disproportionate response to it. In any decent society you don't get to decide to behave in a way that is aggressive and endangers someone just because someone else inconvenienced or annoyed you. That's not how the world works.
We don't see someone breaking the rules and decide to take matters into our own hands. Had AG held her course and continued walking as she was, CW would have cycled past her with no issue at all. Instead, she made a choice and that choice cost a woman her life and AG her freedom, but AG will soon be free and CW will never live again. That's the real tragedy and CW is the real victim. Not AG.