W.r.t. the Ice-T example, a good liquid democracy implementation would still have several advantages over what we have now:
1) If Ice-T does a poor job, his delegators complain that something bad was "done in their name", they can trace to their Ice-T delegation and remove it. They don't have to wait two or four years for an election cycle.
2) Even if Ice-T doesn't know much about, say U.S. foreign policy, he may find someone who does and whose personal values are in pretty good alignment with him and his fans. So, Ice-T delegates his us-foreign-policy votes to the expert he trusts.
3) Ice-T may take his increased power seriously and start learning more about foreign policy so that he can do a good job. And option 1) puts him in check if he does not.