/etc/init.d/libvirtd start fails but service libvirtd start works. Why?

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http://serverfault.com – CentOS 6.3, running as root (Shush). Can you please tell me why I would get initialisation failures from the init scripts but the service command works a treat? There was nothing in /var/log/messages or /var/log/libvirt/* all I have it the Terminal output: /etc/init.d/libvirtd start Starting libvirtd daemon: libvirtd: initialization failed [FAILED] I changed the libvirtd logging level to 1, the highest, but saw nothing in messages after another failure. (HowTos)