Some claim, (like Chris Ferguson does over at Time)that extremist misogyny fostered by rape culture is not the true cause of the attack, and instead point to severe mental illness. The misogyny that Elliot Rodger expressed was, according to those who think like Ferguson, incidental to the crime. Aside from doing the troubling work of further stigmatizing those with mental illnesses, the article leaves Rodger's "mental illness" undefined and, as far as I'm aware, un-diagnosed.
Mostly, this line of thinking neglects to acknowledge that Rodger is not the first to react violently because he thought women had rejected him "unjustly." This sort of entitlement towards the attention, time, and bodies of women results in death at more than the "small percentages" that Ferguson alludes to in his article. Misogyny kills women ALL THE TIME. Rape culture fuels the death of women on a daily basis.
Recently, the Tumblr "When Women Refuse" has emerged as an answer to the question "can misogyny kill?" The Tumblr chronicles real-world examples of the deadly consequences for women when they refuse or reject men. Check out When Women Refuse