Cronulla seems to follow the usual pattern. Young men imported from similar areas to the ones that the Cologne aggressors came from a couple of years ago. Start throwing their weight around, harassing women, committing crime. Except the Aussies obviously have more about them than Germans or Brits, and tackled the problem head on.
Other countries may also prove prove problematic for these aliens. Can't imaging the Americans being bullied, and they're lucky enough to have the proper 'tools' to defend themselves and their families.
I sincerely doubt there will be a backlash in Sweden. Firstly, the problem is getting too big and obviously getting out of control. Secondly, any country that seems to willingly admit these aliens is unlikely to have the stomach to tackle the problem. The populations appears resigned to it's fate.