Except they didn't attack a group of women protesters. You need to understand the difference between the the word attack, and hijack, though I suspect you do, and are trying to rewrite facts to suit your agenda.
The women where doing one protest outside a hotel and asylum seekers, and wern't weren't being violent, and the ballyed up men used the women's presence and lowered police presence, to 'unexpectedly' launch an aggressive protest against the same hotel and asylum seekers, the police and delivery drivers and riders servicing the hotel, not the women.
Whether any of the women where part of coordinating this or not, or whether the men just decided to ramp up the women's protest with violence, or take advantage of it with or without their knowledge, is unknown.
At least two women got involved in more than standing around chanting and flag waving once the police tried to stop the men ramping it all up.
The police went for containment, and called for backup to be deployed from dealing with other crime. They searched some men after flares where discharged in a crowd. No more flares where found.
The one arrest was for assaulting an officer by pushing them.
Don't want to lose your job? Don't break your contract.
Don't want to get arrested? Don't break the law.
Married to someone a position of responsibility? Doubly don't break the law.