This a good question to ask Maxman and one that has had me stumped since I started to enquiry seriously into Reality, Truth, Love, God etc.
It's difficult to accept another's suffering so that I may feel gratitude for not suffering and as a tool to elicit my compassion. It's also very very hard to 'surrender' or accept it as dark grace when the person who is suffering is close to you, perhaps related, and their lives will be severley affected from something they did not desire, provoke or choose.
Karmic arguments are hard to entertain because a 4 yr old's consciousness doesn't understand karma and the damage done by trauma limits the ability to change their karma/destiny/path. I know thats not how it works but thats how I feel.
I'll keep searching and sitting with this and I hope, one day soon I can come back and offer a little light and solace.