Wow, There are some very strong feelings on this thread.
It is a terrible story, an utterly tragic one, and yes, it's something that those poor parents will have to live with for the rest of their lives. I know, i've been in a very similar situation.
Having twins is such an amazing thing, don't get me wrong, any baby is special, but having twins - or more - well, it's astounding. When you're told though, that one of your babies is very very sick and will probably die at birth, if he hasn't already, then it just throws your whole world upside down.
My DS1 was diagnosed at 14 weeks gestation with something called Posterior Uretheral Valves. We were given at that point, three options. We could choose to do nothing at all, and pray for a miracle, we could put our sick baby to sleep - injecting him with a salt solution and stopping his heart, or we could intervene and empty his baldder for him every five days. To empty his bladder would seem the obvious option, yes? No. It meant there was a 75% risk of total miscarraige to both babies, every single time a needle was inserted into him. Given then that i would have had to have had that done at least 40 -50 times for the rest of my pregnancy, we felt it was far too much of a risk to take, especially for our healthy baby. So we chose to do nothing, and hope for a miracle. We got one. DS was born alive and lived for just under two hours.
But yes, there were many many times, during that pregnancy and since where i've wondered did i do the right thing? Would it have been better for him, and ultimately less painful for us, if we'd put him to sleep? We were asked every week if we would consider it, and hell, when someone keeps chipping away at you, it wears you down yunno?
Please don't judge this poor mother too harshly. You can't begin to imagine what she's going through now and what she's got to live with in the future. Perhaps she was making the best decision she could based on the information she had at the time? We'll never know what she has to live with.