Speckfisher, I'm truly sorry for your loss & I know this is an emotionally charged issue for you right now. We all simpathize with your position however there are very few of us that don't also drive "cages" so in essence we all may be at fault sometime. I know that I have made a few mistakes driving & quite sure that others have as well.
Motorcycling is an awesome, wonderful, fulfilling, soul searching, of quintessential experiance, yet very Dangerous activity on the road. I do hope that your loss heals over time & that you can champion the cause of greater awareness in honor of your friend.
Take care.