Was the Port Arthur massacre investigated properly or just trial...

Was the Port Arthur massacre investigated properly or just trial and jury by the media. Martin Bryant guilty from the start.
According to Waleed, this man with a IQ of 66, a loner with a personality disorder and schizophrenia is guilty because he pleaded guilty. No need to investigate further. Case closed, end of story. If you use your brain to examine events and find anomalies in the media story you are a conspiracy theorist.
The police being decoyed away from cafe is strange. Did Martin Bryant call in the drug find to divert police away from the area?
Maybe it was just a massive coincidence.
He shot like a seasoned expert. Maybe they were just lucky shots.
Plot thickens.
The event certainly changed gun laws in Australia.