This is a very hard thing for many people to grasp, because... it challenges so many of the things that, for them, make life worth living.
the idea that there's an inherent justice to the world, and those who consistently do right will eventually see some good results from it, something that makes it all worthwhile.
the idea that you are safe.
the idea that you deserve whatever good things you have. (and that you don't have any reason to give up your own happiness to feel bad for others who lack those things, or give up your own good fortune to share with them)
and that lacking good things happens for comprehensible reasons-- so if you do the right things, you don't have to fear ever being one of those who lack. (And that you actually have any real way of knowing what "the right things" even are.)
the idea that we, individually, have any power over what happens to us.
the idea that free will is actually meaningful, and that the few meager things about our lives that we can (somewhat) control are actually capable of making a difference against the vast enormity of what we can't control.
...the fact that none of these comforting thoughts are true, feels awfully bleak and hopeless.
To the point that, if your own life hasn't yet forced you to give up those beliefs, you might find yourself unable to let go of them, because the alternative is too terrifying
As someone with mental and (increasingly) physical disabilities, my own mental health fights a battle against this hopelessness every. single. day
I believe there IS actually some hope for something better...
if enough people can come to the agreement that a lot of people's good fortune (including good health) IS really just luck... and that the bad things in their lives (often even including bad behaviors!) can get at least somewhat better with help from others...
if enough of us could someday let go of the concept of deserving and not-deserving... this focus on blame and punitive justice, and this obsession on bad circumstances being deserved punishments
and if enough of the more fortunate people could contribute from their own lucky circumstances to help others... with no thought of who deserves what, and no other goal except making a world that will, in general, overall, be better for pretty much everyone
Well, I'm not saying this will make everyone's life live up to the current unrealistic ideal of perfect health.
(It won't! there will still be people with severe problems, both mental and physical! And if people's current expectations don't change a whole lot to go along with it, there are gonna be a lot of people who think this whole societal improvement was a failure, even if it does succeed!)
But. if humanity can find itself capable of this big, big shift in worldview? then... there is hope. For something better. Not great, not perfect, but... better.
And it's hard enough to believe this is possible sometimes. Because, again-- even if I do all of what I think are the "right" things, in order to work toward this better world? That doesn't necessarily mean anything will come from all my hard work.
Like everything else, it'll depend on luck. And on the combined actions of lots and lots and LOTS of other people, none of whom I can control at all.
But it's all the hope we've got, so... I still try.