Dude is just Sabaton meets Bijelo Dugme. He was with HOS (NDH resurrection army) for like 2 months in 1991, then got a hit song named Čavoglave (after his home village in Dalmatinska Zagora). His importance is severely overestimated. It's just that millions of yokels get introduced to metal music and think he's god of music.
Thompson is a fake ustaša and a HDZ plant who takes bribes not to sing too often. He also left his first wife for no reason and he avoids paying taxes. He is the government's good goy.