I don't think
you're trying to be hard. I think you're trying to rep
San Francisco as hard, to sell a narrative of the city as a place so beset by crime and class conflict† that responsible residents all follow a code. Knowing that code, any responsible white dude should know that letting his dog off the leash could end in someone losing their life.
What I have a problem with are stories with "good guys" and "bad guys". Very few stories are really like that, despite what Solnit so obviously wants you to believe. There's just tragedy layered on top of tragedy. There are injustices to be found, but they're probably not the ones you want --- the injustice isn't "white dude didn't follow the sacred white dude code", but rather "we give all the police firearms and put them in situations where they'd need to be superhuman to forestall tragedy", or "our care for the mentally ill is fucking appalling".
I don't care why Eric Snow is in San Francisco. He's a racist gun enthusiast. I'm never going to be his friend. But I also don't feel like I have any right to tell him where to live, and I don't feel like you do either.
And he sure as shit didn't kill anyone that day.
I'm "Thomas", by the way. :)
† We can both name cities that are really like that.