Let's not forget that about 2/3 of motorcycle accidents involve a vehicle turning left in front of a motorcycle.
Does it? Seems that about half of crashes are single motorcycle no other vehicle crashes where the motorcycle lost control and and left the roadway. Even a good number of the remaining multiple vehicle crashes started out as a result of a motorcycle losing control all by itself before it slammed into another vehicle.
Of the remainder, yes there are a number of left-turn collisions, but even there rider error or misbehaviour is a factor in at least some of them.
This is just a summary of the 2011 fatals that I've found in the media so far this year. I'm quite sure there are more, but 33 at the 2011 season's half-way point (given 53 fatalities for all of the 2008 season) suggests I've found a good number of them.
33 fatal crashes, Date, approx location, rider name if known and ? if not known, crash synopsis.
17-Apr sarnia ? lost control, excess speed, hit curb and fence
30-Apr gardiner expressway Gauthier lost control, flew over median, landed in oncoming traffic
5-May kitchener Lazic high speed in city, lost control
5-May waterloo Summer lost control on curve
13-May west lincoln Yellow car at fault head-on
13-May kemptville sutcliffe bike crossed in front of highway traffic
31-May brantford ? intersection, unknown fault
1-Jun 401 Oshawa Forsythe rear ended car, fell under truck
5-Jun Elgin Cty Gilders lost control, left road
6-Jun west lincoln ? rider crossed center line on bend, hit oncoming truck
8-Jun highway 9 ? ran into back of car
9-Jun keele and 9 ? lost control, left road
11-Jun ottawa adamo lost control, hit culvert
12-Jun highway 9 metcalfe car lost control after collision with other car, crossed into opposing lane and hit oncoming rider
17-Jun cornwall randlett truck left turn in front of bike
17-Jun ottawa thibodeau bike hit deer
17-Jun fenelon falls Keveza bike swerved into oncoming traffic
19-Jun sarnia Wardell intersection collision with van, van believed at fault
30-Jun north pickering ? car left turn in front of bike
3-Jul elmira martin truck left turn in front of bike
4-Jul drayton Tennant bike ran stop sign, hit car
7-Jul Pickering Bayly Tony Excess speed around corner, went wide, hit car starting to make left turn into driveway
11-Jul niagara falls ? lost control, hit abutment
13-Jul embrun forgues intersection, unknown fault
17-Jul 401@Hanlon Collins ran into left turner at high speed while running from police
17-Jul Powassan Muldowney lost control, ran off road
20-Jul norval ? lost control, hit tree
26-Jul Owen Sound McCartney car left turn in front of bike
2-Aug Vaughan Torchia truck made left turn/ rider lost control, possible excess speed?
2-Aug windsor Abbas excess speed, wide on turn, head-on into truck
4-Aug deep river Briere Lost control while passing, left road landed in ditch
7-Aug toronto(dixon rd) ? Lane split(?), high speed through intersection, hit by left turner
8-Aug 410@Steeles ? Rider excess speed in morning rush hour traffic ran into back of large truck
The only things usual here are that it's a dumptruck, which some might say makes this more unlikely (not sure why), and the rider was a cop, so there seems to be some higher standard of ridership being applied to him.
Yup, but scrutiny and an expectation of a high standard of riding should apply regardless of who the rider is, and regardless of whether the scrutiny is coming from investigating cops or from commenting riders.