The XMMS2 help says this for one it's command line options:
One of the first things I learned about Linux, was, to not run programs as root. And I've seen this all over (this one is a little more extreme, though). And until I saw this, I've assumed that it was for security concerns.--yes-run-as-root Give me enough rope to shoot myself in the foot
Why is so bad to run programs, including trusted programs, as root?