System of a Down Share Brutally Honest Explanation for Lack of New Music

System Of A Down are still together -- they reconvened in 2010 after a four-year hiatus, and they have a few tour dates coming up in October -- but they haven't actually released any music in 13 years. Their last album, Hypnotize, came out in 2005, six months after its companion album Mezmerize, and their self-titled debut…