US man accused of decapitating disabled son, 7

http://www.straitstimes.com/BreakingNews/World/Story/STIStory_702584.html

Today I read this article in the news. And I will be writing about the article from the perspective of a Catholic.
All evidence seems to point to his father. And his father said that he was fed up of taking care of his disabled son, in another article about this case. I feel that this case is rather hard to judge, and it was rather sad. Because, it concerns disabled kids. Disabled kids are extremely difficult to take care of, and sometimes it is difficult to remain patient with the child. Ok, now I am looking at the topic of disabled kids generally, and not just about the case. Perhaps a child is born with a different way of thinking, and perhaps he has physical disabilities. Now, does the child suffer? Or does the child actually feel normal about his own disabilities? That is a good question.
Sometimes, the survival of the disabled child is hard to guarantee. The parents spend long periods of time taking care of the child. And when the child gets older and their parents leave this world, how are they going to fend for themselves? In this modern age, there debates regarding whether such children should even enter the world. When physical disabilities are detected while the child is still in the womb, is it moral to abort it?
As a Catholic, I feel that it is still a life after all, and it is not right to kill it, as it is an extremely painful process of dying in the procedures of abortion. And read the article, the child was killed when he was 7! When the child is born, he will grow to be more aware of his surroundings and it will be more painful when death comes. It is easy to say that it is immoral to abort the child. But if it happens to him, would he take care of the child? Will he be able to be patient and handle the child? Due to his disabilities, he will suffer in this world. Will the parent let the child suffer? I feel that it is hard to define a right or wrong. What do you think?