Tomorrow is a known unknown but death is unknown unknown.

Consider someone in pain/depressed for a long period of time. Everyday, it’s the same. Maybe tomorrow will be different but looking back , it’s unlikely. Looking back a year ago, it’s the same. 2 years ago, it’s the same. Sure tomorrow is unknown but its kinda lesser form of unknown. Like infinity. There’s a different infinity(in maths). Which is more likely, you having the same economic situation tomorrow or you going to be a billionaire?

Death on the other hand, it’s the unknown, it’s different, and possibly the end of suffering. I don’t advocate for suicide and don’t agree with it but I see the appeal.