Have You Ever Felt Guilty Winning Against a 'Whale' who is clearly a gambling addict?

Have any of you ever felt conflicted about playing against clearly addicted, losing players? Let me share a story that has stuck with me and made me reflect on this issue.

A couple of months ago, I played in a private game with a big 'whale'—a guy who was obviously very high, on tilt, and rebuying max every time. He was going all-in almost every hand, playing 4k pots with no regard for strategy. We played 20 hours straight that day, it was 10 a.m., and he was still rebuying and throwing money in against three regulars (including myself). There was no cheating or collusion on our part; it was simply that he played so poorly that we barely had to play against each other. It was free money.

By the end of the session, he’d lost around 43k at a NL500 table. A couple of weeks later we realized he lost all his bankroll that day.

At the time, it felt like just another win, but looking back, I feel conflicted. There’s a part of me that wonders what it would be like in the shoes of someone on such a self-destructive path. Has anyone else had these kinds of reflections? Do you ever feel a moral conflict when you’re up against players who seem to be gambling addicts? Would you ever tell him to quit?