Hate is more powerful than love because hate can be entertaining and easily accepted. Hate starts to take effect at a young age. Small children watch television shows with fighting and guns. After the show they start to reenact what they have seen, by kicking the air and shooting fake guns. That just shows one form of hate that can teach a kid to be hateful from the beginning of their life.
Adults see hate everywhere also.
Movies, television, and songs are all hate filled. There are love songs, and movies, but then don't have mass appeal. I haven't seen a love centered television show. Hate is also more appealing to the majority of people. If I tell a little child to love something they are usually hesitant.