The rationale for loving others is the recognition of the simple fact that every living being has the same right to and the same desire for happiness, and not suffering, and the consideration that you as one individual are one life unit as compared with the mulititude of others in their ceaseless quest for happiness.
When you begin to become conscious, more aware, when your eyes begin to open, the first thing you see is how deluded you are and how much you're holding onto that which makes you suffer. This is, in many ways, the most important step: Are you willing to be aware?
But what if pleasure and pain should be so closely connected that he who wants the greatest possible amount of the one must also have the greatest possible amount of the other, that he who wants to experience the "heavenly high jubilation," must also be ready to be "sorrowful unto death"?
I can't imagine turning into one of those codgers who no longer reads fiction. I'm regularly stirred by it and suffer no anxiety of influence. Influence me! That was my credo then, as I was developing and learning, and remains so now, as I'm developing and learning.