It reminds you how fragile every character in the Game of Thrones really is. You go into the series thinking your favorite character is invincible, because why would a man kill off a main character as powerful and honorable as Robb Stark or as merciless and sadistic as Joffrey. But, you realize in the end that both were just children shoved into things they weren’t ready for.
Which brings me back to the fact that Robert Baratheon, as much as he hated the Lannisters and despised his children because they looked them he cared enough about Joffrey to realize that he wasn’t ready for the throne, a thing he was foolishly thinking he was.
Joffrey was that character that we all loved to hate and hate to love.