These have been answered over and over.But not satisfactorily, which is why the questions keep coming back. Mormons who desperately want to believe the pat answers accept some very weak and often illogical reasoning but skeptics are going to demand a higher level of proof. In most cases, the LDS "church" has never been able to provide this level of proof.
Some will never accept any answer. Many don't want an answer. Those that are blinded by hate will always say “ They are not answering “ Are they really looking for why this man wanted to be shoot ? I think not. We have a troubled man that wants to be shoot and because of this I must explain why ? No one knows why. His lawyer says he had a troubled youth and many brain damage.
Surely you can't expect the LDS Church or it's members to explain his thoughts.