Dude. Just keep watching the show

I mean it is. It end pretty peacefully

I think the problem is you are focusing too much on more dark and cynic stories like watchman and the boys.

Invincible at his heart in the comic and at for now in the TV show is about being truly a hero like most classic super hero comics like spider man and batman. It just have a more serious tone towards how this lvl of power translates to a world filled with fragile humans.

But the theme is doing what’s right No matter the cost, standing up for what is right. Even having the strength to forgive enemies and build a better future. The entire comic revolves around mark struggling to keep being a hero.