I don't know. I've often wondered that myself. I feel sort of selfish for thinking it, because it's not like they owe me anything anyway. Whereas I owe them everything.
But it seems like the more you struggle, the harder you find things, the more stressed you become, the more violent, angry and misunderstanding people become. It's like they're screaming try harder, try harder, try harder, you're not good enough, when what'd truly help is a nice warm hug and somebody to listen.
I guess they just don't really understand what you're dealing with? You could use this as inspiration; you'll hopefully remember to always be there for people from now on because you know how bad it feels when no one's there for you.
Or, it could be that they want you to toughen up. I don't know what to think of that though really. These days, everything is kind of stressful and hard. We could all do with being a bit more compassionate to one another.