BANGKOK, Aug 28 (Reuters) - A bloody insurgency in Muslim southern Thailand is a struggle for the independence of its ethnic Malay majority involving tens of thousands of people ready to die for their cause, a senior separatist figure said. In his first interview with a major news organisation since violence flared 20 months ago, a spokesman for the Pattani United Liberation Organisation (PULO) said his movement had no ties to international groups such as Osama bin Laden's al Qaeda or its southeast Asian affiliate, Jemaah Islamiah. "We have no connection with those terrorists," the senior member of PULO,...