Well, That Sucks!
Left-turners are the worst. You'll swear sometimes that they actually made eye contact with you, and STILL they'll turn right in front of your path! I think a Motorcycle's small profile just doesn't register in the brain like a car would.
Could be you couldn't have avoided the crash no matter what you did. Even Hyper-vigilance at intersections doesn't always prevent crashes there.
Heal quickly.....