He bears much of the responsibility for his death. When a public servant is killed, it discourages others from being public servants or putting themselves in dangerous situations for our protection.
This sort of victim-blaming seems to crop up across a whole range of topics, and it seems to me the psychological cause is the same in all of them.
People don't like to consider themselves to be vulnerable, they want to believe they are masters of their own destiny in all contexts. So if someone suffers badly at someone else's hands, the first thing such an anxious person is going to do is examine every last detail of everything the victim did, in order to find something they can point to as something they did 'wrong'. Then by convincing themselves that they would never do that wrong thing, the anxiety that goes with vulnerability is staved-off and they can feel safe and fully-autonomous again. They don't have to consider the possibility that those with power might not have their best interests at heart.
If and when one day it goes wrong for such an individual, you can bet all their like-thinkers will immediately turn on them and in turn find something _they_ did wrong, demonstrating that despite their previous insistence, they weren't infallible _enough_ after all, thus allowing the rest of the clan to go on feeling powerful.