We may all in fact have tendencies to extreme aggression. We also have higher-level urges, though, leanings towards behavior that can be appreciated only by thinking, elevated beings. The lower drives respond to simplicity and repetition. Frequent reminders of a clever but brief aphorism might do the trick. Simple words and images don't make the grade.
Arguments have to be subtle, persuasive, and nuanced.
Hatred is base and primitive, and therefore excitable through more primitive means. You can stir it up through repetitive exposure. The need to lavish love upon others, however, has to be carefully taught and nurtured. At the root of this, of course, is Judaism's understanding of good and evil. Too many believe that if you remove the evil within man, you are left with good.