The APL isn't responsible for the pitch invasion, but they need to be asked why better precautions weren't taken to protect the players. The fact the pitch invaders were able to bring flares to the ground and managed to get them past security is a huge red flag on the APL's poor record of keeping troublemakers away from games. This isn't the first time flares have been used by fans at A-League games. Security needs to search attendees better to ensure these sort of items do not make it through the gates. Anyone caught with a flare in their possession should be evicted.
According to this video the OSM were always going to invade the pitch and it was well known on social media.
Firstly, the APL and teams only have so much control over stadium security, so it's pretty silly to blame them for that.
Secondly, security was lowered at A-league events after years of active supporters groups, and A-league fans more generally, claiming that the heightened security at soccer games, and specifically around active supporters groups, was discrimination, and that crowd disturbance and rates of violence at A-league matches was similar to other major sporting events (which is technically true, but also a twisted statistic as the types of violence are different, but this is a tangent).
Finally, though it's not impossible that some individual members of OSM had said they planned to invade the pitch (who knows), OSM it's self had not made it public that they planned to invade the pitch. That's simply untrue. They were vocal on social media about participating in the protests by walking out of the stadium on the 20th minute, but A. that's obviously not what happened, and B. it wouldn't have been a problem if they did. In fact it's what they should have done just like all the other active support group in the league managed to do without assaulting multiple people.
In other words, active support groups got the privileges they wanted back, only to abuse them relatively quickly after that point, and the only people to blame for that, and the inevitable crackdown that will come to soccer games nationwide, is the OSM. This isn't a time to shift blame or try to use this to push an agenda. Those f**kwit OSM members were the sole cause of the problem, they've bought this down on the A-league and soccer more generally, and they deserve everything that they get for it.
It's just bloody lucky that things didn't escalate, if City's fans had taken it on themselves to defend their team or take revenge, then it could have been an even bigger shit show.