Seems as though enabling didn't work, either. Mental illness, emotional pain, self-medication (if that's what an emotional "aesthetic" means). Others have vouched for him, a good guy merely caught in a bad choice, as so often happens after the fact. People knew him. You're claiming to know him as well, reading between those lines, so obvious was the problem.

So, about the car keys. Why the car keys? Explain that. Rationalize that. Others knew. How does compassion address that? Or does recognition of that fact hurt too much to be useful?