You begin to realize that you have to respect the bad choices people make and that you can’t fix it for them (and at times even for yourself). Then you do what you can and let the rest go.
For example, politically, you can’t fix the system and you might even suffer because of it; however, you can do your part and trust that you know in your gutt that you will be okay somehow. You did your best to take care of yourself and others. Now it’s time to let it go.