Yes IF the officer placed his cruiser in a position that left the rider NO way to avoid then that is wrong. VERY few of you have ever, (as I have worked as police officer), you have MILLISECONDS to make a decision. These decisions can lead to a life altering or life ending result.
I can assure you this officer didn't go on shift that evening saying, "goodness I hope someone dies tonight" Now having lived in Keswick for many years I am familiar with the road. The cruiser could NOT have completely blocked both lanes completely. There would have been enough space for a skilled rider, riding at a responsible speed to have avoided the cruiser. BUT for me to suggest that was an option is as silly as the poster who said a single bullet to a "non lethal" part of the body by police was an option in one of the other cases. Forget what you see in the movies.
Now having said that, posters have also said the officer placed "the public in danger" by, (IF he did positioning his cruiser on the road the way he did. This is not true. It placed the rider in danger. Now seeing as everyone likes to make assumptions, assume that the officer had let the rider pass pulled a quick turn and began a pursuit. The rider takes off to run, (which given his bravdo on FB is not out of the question). The rider then collides with another vehicle and kills a family of say 4. The officer would have been crucified, for pursuing the rider. But there still would have been a tragedy.
I realize that he was your friend and it is natural to try to place blame upon others and believe your friend did nothing wrong, I am sure I would do the exact same thing. But we have to be honest, the force of the collision clearly shows that your friends bike was traveling no where near the posted limit on that road.
NO ONE deserves to die, but sometimes people do things which contribute to the seriousness of the situation. You say the rider "didn't ride beyond his ability" well I would assert in this case he rode in a manner which made it impossible for him to stop or at least slow to a speed which may have been survivable. In this case it was a police cruiser, but it could have been a motorist making a left turn or u turn, the result would have likely been the same.
But let's not waiting for the accident reconstructionist to say how fast the rider was going or any other contributing factors. Let's blame the police as we as citizens never do any wrong it HAS to be the police all the time.