Muammar Gaddafi's son went on Libyan TV to defend his father's 41-year rule of Libya as protests spread to the capital Tripoli. The most violent scenes so far of the wave of unrest sweeping the Arab world were seen as Gaddafi relied on brute force to crush what began last week as peaceful protests but now threaten his regime. After a bloody crackdown that saw troops and mercenaries shooting unarme