People always refer to the Sudanese youth as if they are Muslims. I know it sounds sectarian to press this point but - they are not. Most Sudanese who come to Australia are refugees from South Sudan and are Christians. In fact, they often have a loathing of Muslims, and Islamic women in Australia are sometimes afraid of them. (Not all of them, obviously, just the violent, menacing ones.)
About Wagga - yeah. There is a minority of troublemakers. This will get worse in time, as there is a lively drug trade, and circulation of that drug ice.