Basically, because Australians can't follow instructions and need to have a fuck no matter what. 
from cnn :
"Professor Sharon Lewin, Director of the Peter Doherty Institute for Infection and Immunity said the increases in numbers seen in Victoria were not happening over the rest of Australia.
"What happened in Melbourne was some breaches in quarantine, transmission from people in quarantine to the security guards in those hotels and then spreading amongst communities linked to those security guards," Lewin said.
Last month, Australian officials launched a judicial inquiry amid allegations the fresh coronavirus outbreak in Victoria was sparked by some contracted workers not following protocols at a hotel used to quarantine international arrivals -- including reportedly having sex with people under lockdown.
"We've also had outbreaks in some industries which is quite common around the world. We are also seeing outbreaks in housing projects so we are seeing different communities effected which is a lot more challenging now. Community transmission, people in high-density living, so the problem is bigger," said Lewin.
On Friday, Andrews said that over 130 people -- one in four of those who've tested positive -- were caught defying stay-at-home orders. Doorknocking teams dispatched to check on infected individuals were increased to 34 teams of three, he said."
https://edition.cnn.com/2020/08/03/australia/australia-melbourne-coronavirus-intl-hnk/index.html
from cnn :
"Professor Sharon Lewin, Director of the Peter Doherty Institute for Infection and Immunity said the increases in numbers seen in Victoria were not happening over the rest of Australia.
"What happened in Melbourne was some breaches in quarantine, transmission from people in quarantine to the security guards in those hotels and then spreading amongst communities linked to those security guards," Lewin said.
Last month, Australian officials launched a judicial inquiry amid allegations the fresh coronavirus outbreak in Victoria was sparked by some contracted workers not following protocols at a hotel used to quarantine international arrivals -- including reportedly having sex with people under lockdown.
"We've also had outbreaks in some industries which is quite common around the world. We are also seeing outbreaks in housing projects so we are seeing different communities effected which is a lot more challenging now. Community transmission, people in high-density living, so the problem is bigger," said Lewin.
On Friday, Andrews said that over 130 people -- one in four of those who've tested positive -- were caught defying stay-at-home orders. Doorknocking teams dispatched to check on infected individuals were increased to 34 teams of three, he said."
https://edition.cnn.com/2020/08/03/australia/australia-melbourne-coronavirus-intl-hnk/index.html
