He took it upon himself to trespass.
"THE STATE" did not set this sequence of events in motion.
“...He took it upon himself to trespass....”
True enough. He did.
“...”THE STATE” did not set this sequence of events in motion...”
True enough again.
But the moment “the State” forcibly took him into custody, they became responsible for his well-being while under there auspices.
Look up the meaning of custody; The FIRST synonym is “safekeeping”.
And if there is a mental health aspect of it, then they are also under obligation to make sure he’s not a danger to himself, or to others.
The state, by their actions, set an entirely different set of events into motion, which ultimately led to his death.
I’d think a judge and jury would find it fairly clear.