NO, IT'S NOT. If something bad happens, are we no longer allowed to analyze the actions of all parties in the run-up to the incident? Are the decedant's actions to be ignored completely? That doesn't seem wise, or an effective way to learn from a tragic situation.
To take it away from the hot-button cases: let's say a person starts crossing a street without looking for traffic, and gets killed by a car. Since that person is now dead, do you believe it irrelevant that they didn't look for cars before proceeding into the street, because of pedestrian right-of-way? Is saying that checking for traffic would have prevented their death "victim-blaming?"