Just wondering.

If it is true, as it sometimes seems to me to be, that I identify to a ridiculous degree with whatever novel or memoir I am currently reading, that I become so truly lost in a good book that the real emotions of my real life are felt less keenly than those absorbed through the fingertips, if indeed I am what I read, for the duration of the reading it, then why, well why, for what possible reason, do I read so many lonely and depressing books?