I am still grappling with a succinct "reasons why humans hate/discriminate against/kill each other," but it is in this same vein that I am motivated to study religion/theology and its dynamic intersection with culture. We indeed need a cultural and spiritual transformation.
And, if you even glimpse at the news sporadically, you are more than aware of how much room for change there is in our many religious, political, educational, and cultural spheres. There is so much more room to love more widely and more deeply. I think all hands are needed in this--no matter your career/hobbies/skills/passions etc.--because each of us have our own ever-widening circles of influence where we can be more loving and encourage others to do the same.
And to those of us who are able to devote ourselves 'full time' to questions of religion and culture (I would place many students and scholars of religion more broadly in this category, as well as those in leadership positions of spiritual communities), well...... I hope we can find creative ways to use our insights and knowledge to evoke positive change.
p.s. please feel free to kick me in the pants whenever I (again) begin to fret more about trying to walk delicately on egg shells in some imagined-path to a tenure track job than I do about following my passion.