What you posted confirmed what I said.
Then if we said the same thing and you say I'm lying then you are also lying. What actually happened in Martin place is the cops have no ability to conform to occupational health and safety standards while attempting to make an arrest and have no person amongst them brave enough to negotiate as they do in other countries, and that is being generous. otherwise they were simply committing a summary execution. To handle things professionally is to determine the mindset of the suspect, and given the person had not shot anyone straight away, then he's not a shooter like port arthur or columbine or any of the weekly massacre's in the USA. Mass murderers in most cases start their shooting within an hour of their arrival on site. Like in strathfield. Attention seekers, you know, the type who write thousands of letters to politicians trying to get their attention, will give up eventually because like all humans they need sleep eventually. After 17 hours, it wouldn't have taken much of a negotiator to arrange this, it would only take enough balls to walk in. They should have asked a firey. Instead of negotiating where nobody had been killed, which in most countries is the rule, 'you don't storm the place when no-one's been killed' they stormed the place, with obvious results. Go get a manual from any country and see what occupational health and safety says about making an arrest. If a Lion broke into a movie theater, parroting that it was a lion and they couldn't negotiate with a lion is no excuse for burning the theater to the ground with all inside.
To say the police killed everyone who died that day is being generous. To point out it was their failure to follow procedure or not have any procedure at all would be less so.
edit : there is plenty of useful stuff on the web, including for dealing with nutcases
https://www.psychceu.com/miller/Miller_Hostage_Neg.pdf