For a long time now, I've considered the whole idea of, "“I suffered, so why shouldn’t they?” a sign of emotional immaturity.
When I was young I was in that camp, but over the years, life experience has taught me that we are not all the same, that we don't all have the same brains and abilities, and that sheer dumb luck plays a large role in the opportunities you manage to take advantage of in life, and in the misfortunes that befall you. I thought at the time that overcoming hardship was just a matter of fortitude and endurance, and that there was no valid excuse for failing to climb out of poor circumstances.
I'm older now, and -- I think-- wiser, and I realize what a snotty arrogant attitude that was on my part. I have a lot more compassion now that I have decades of being a grownup behind me.