As much as I hate to see bipolar illuminated this way in the news, I don't see anything inflammatory or inaccurate in this article. The people affected have acknowledged that this isn't a character flaw and that something is amiss:

When his mother was still living, Burton seemed to have a handle on his bipolar disorder, according to Kenny and Melissa Brooks.
His condition has deteriorated since he lost his mother, said Kenny Brooks, who called Burton a friendly guy when he’s on his medication.

The unfortunate truth lies in the fact that there are times when we are not well, due to various reasons that may or may not be in our control, and that some of us can become violent. I think the stigma comes in when it is only the negative aspects or times of illness that are highlighted, or when blanket statements about people with bipolar are made. There have been some success stories highlighted in the news, focusing on various celebrities and politicians who have successfully managed their illness. But there needs to be more of this, and less generalizing, in the media.

But this article? I think it's pretty accurate.