First of all, I didn't say she committed suicide. I said that she killed herself, meaning she was responsible for her own death. That point you cannot argue.She didn't commit suicide, so it is not proper to say she killed herself. Also, substance abuse and addiction are not issues of bravery versus cowardice.
I don't know why people feel the need to go to such extremes in judgement. Basically, a talented person who gave much to the world, but who was also flawed (as we all are in some way) has died. Some people feel her beneficial contributions to the world outweigh her harmful flaws that affected her personal life. Some may disagree with that, but there is absolutely no cause to claim that honoring her is a dishonor to others.
There is no requirement to die for your country or to save others to be honored by flying a flag at half staff. Many people had the honor simply because of their political position, irregardless of their actual achievements.
I understand your opinion, and will not argue against it. I simply don't believe she's done anything worth flying the flag at half mast for. A national tragedy in which many people have died would be worth it. I.E. 9-11. However, I agree with nsaspook's point, in that flying the flag half-mast for a single drug-addicted, alcoholic musician seems to mock deaths of the thousands of innocent people who lost their lives in those national tragedies.