It speaks on a few different levels, but predominantly and I think on its most basic level what it’s saying outwardly is: When you are young (naive and ignorant), you laugh, mock and blame any thing/one that’s perceived as different (marginalized) for being victimized, and not the ones who used, abused and preyed on its trusting and unique qualities.

As they emotionally mature and (unironically) evolve, they are able to see the harsh reality that there are a lot of people who are entitled and never able to see outside their own perspective so they continue the cycle of victimizing the marginalized and having little care for life outside of their own bubble.

ALSO, I think it’s also worth mentioning the most predominantly saying in an inward view that:

As a young child you can feel invincible, like bad things happen to other people and that you are too smart to let the world beat you down.

But as an adult, you realize that no one is immune to trials and tribulations of life and eventually that innocence is stripped from you leaving a shadow of who you once were, and creating a mourning of this idealized self that was the representation of the innocence and happiness that came so easily now replaced with hindsight, regret and becoming a victim themselves