Sounds like an anti gun study to me...as I assume those 172 dead bears did not die from pepper spray - the gun MADE a difference in the outcome of these encounters.
There's also a study which shows that people who used pepper spray were more successful preventing a bear attack than those who used firearms - that one was more likely to be attacked using a gun and less likely using pepper spray...Not everything is anti-gun or pro-gun - sometimes it's based on statistics and study...