I was also reading this article and thought the same thing but after looking into the details it’s very clear that the teacher Leanne was stabbed multiple times almost immediately in the attack (makes sense he’d have tried to get the only adult in the room out of the way first) to the point that doctors were worried a lung had been punctured or that her spine had been injured to the point she would end up paralysed etc. Despite that she screamed to the children to run and managed to herd a lot of the children out with her and get them to safety while she raised the alarm on her phone while leaving, and actually not just with police but also men working and living in neighbouring buildings, who helped immediately. I really don’t think she could have done more in the situation, she was incredibly brave actually, and she is right that someone needed to raise the alarm ASAP, she was never going to be able to take on this almost 18 year old boy armed with a wicked knife successfully by herself without help.
The organiser I think called Heidi locked herself and at least one child in the bathroom, easy to say from afar that she could/should have done more but it’s hard to know how you’d react in that situation and exactly what she knew about what was happening at that stage of the attack etc. And I bet the parents of that particular child/children are very glad she didn’t take further risks with them having got herself and the child(ren) to safety.
There was also a man working in another room/business on that floor who came out to see what was going on and presumably try to help, he got stabbed himself as a result.
The men working in the garage next door and one across the street also helped look after the children who had successfully escaped and did CPR, first aid etc while raising the alarm, and they went over to try to intervene in the attack when the police arrived anyway. And at least one person in the car park was keeping kids safe in their car as well.
So there were adults very much trying to help at the time. I get what these parents are saying, it must have been incredibly traumatic for their child in that moment amid all the chaos, but I’m not sure it’s exactly a fair comment they've made here, despite their preceding comments saying they understand someone had to raise the alarm etc, knowing how these teachers were criticised at the time and have suffered as a result of survivor’s guilt etc. However it’s understandable they probably have some anger around the fact their child was left dealing with things without an adult at that moment in the chaos.