It's common for people to confuse an explanation with an excuse or a defense. Don't get confused. It's just an explanation.
Suffering from Aspergers makes it almost impossible to develop social skills, the self confidence and the sense of belonging that social skills provides one with, and the overt signs of self confidence that women are attracted to.
Men who lack self confidence are the male equivalent of women who are homely. They're just not attractive. Men who are gushing with self confidence are very attractive to women. Unfortunately, most women appear to be completely unable to tell the difference between a confident young man and a cocky, violent sociopath like Jared Remy. Men who enjoy bullying and humiliating socially awkward men like Elliot Rodger appear to be almost irresistible to some women. This tendency to reward bullies is the real reason he hated women.
In the last couple of decades there's been an increasing number of movies, television shows, and of course, video games where the basic premise is that the world we live in isn't real. These products are primarily marketed to individuals in their teens and early twenties and have an especially strong appeal to young males who not only don't "fit in" socially but have spent their lives being made to feel powerless by bigger, stronger males. Elliot Rodger grew up in a world where escapism was never any further away than his fingertips. Like Adam Lanza and so many others before him, he probably had no difficulty developing a fantasy world where killing those he hated and then taking his own life would simply transport him to another, no doubt more pleasant world.
Bullying and ostracism made him hate just about everyone and allowed him to place no value on human life.
Escapist forms of entertainment like videogames, virtual reality, and the internet allowed him to lose his fear of death.
Firearms allowed him to be much more lethal than he would have been with just his bare hands. Don't be fooled into believing that the absence of a gun would have saved lives. He could just as easily have bolted a homemade sword to either side of his vehicle and driven through a crowd of people or rigged up something to spray burning gasoline into a crowded room.
Once again no one appears willing to address the problem of adolescent cruelty. We're going to see more Elliot Rodgers committing kamikaze type massacres.
This is not an excuse or a legal defense, but I believe it's pretty close to what was going on in his mind.