While I am opposed to the lockdowns on scientific grounds, and sympathise with people who are hurting, assaulting police and putting them in hospital will be totally counter-productive, beyond the obvious wrongs. The ordinary Australian people do not support this sort of violent civil disobedience, which is right out of the US antifa little red book. The assaulters came for a fight taking weapons like beer bottles with them; so much for concern about Covid. I hypothesise that many of the violent protesters were from the Left, but there is no information on this.
The protests will only extend the lockdowns, and worse, before too long someone is going to get killed, the way things are out of control. By all means protest the lockdowns on-line, but breaking the law is quite another thing.