Also yes, I don't see him doing anything that will affect bystanders, but picking a fight and making sure he doesn't win or some kind of suicide by cop (especially if a grand gesture of giving the city back to the police were involved, if only in his own head) is something I think would fit - like handing the Punisher arrest to Brett but ... much more.

I think he probably does think that Foggy and Karen either won't care or will at least be better off, but with the myriad ways Matt could kill himself with plausible deniability that that was even his intent, I think he may even want to give Foggy a "win". "You said it would kill me, and you were right."

There has been a couple of occasions writing this that I've skirted dangerously close to the "Suicide is selfish" ridiculousness. That is not something I believe, but I could well see Matt believing it, not of other people necessarily but of himself. But that is maybe projecting again, I never think of other people that way, but when it came to me, I could not stop thinking about how bad other people would feel even though I was convinced they hated me, lol. As I said, depression and sense-making do not necessarily go hand in hand.