In my humble opinion, we should not let this tragic incident degenerate into motorcycle bashing.
First, I am not justifying what the motorcyclist did, he was a stupid squid (sport bike rider that does wheelies, stoppies, and generally engages in obnoxious behavior) that paid the ultimate price and also injured a completely innocent person.
However, motorcycles and bicycles have much in common besides the fact they both ride on two wheels, their common enemy is the automobile. I ride, sometimes race, bicycles and motorcycles. On both bikes and motocycles, cars cut me off, don't stop for me when I have the right of way, try to see if the can get within one foot of my back wheel, try to run me off the road etc.
Don't let the actions of one stupid motorcyclist make you write them all off, motorcyclists and bicyclists should stick together for their common good.