Question about end part of The Phoenician Scheme

Just finished the movie and I definitely need a rewatch but I feel like overall I followed it pretty well.

The biggest thing I'm confused about - it seems like Uncle Nubar had a flashback/epiphany while holding the grenade, where it flashed those pictures, and suddenly decided to end his own life amicably (by suddenly holding the grenade close to his chest). What was that about?

The only thought I have is that maybe it was a representation of the epiphany/moral shift that Zsa-Zsa was having with each near-death experience, but I'd love to hear other thoughts.

Thanks!