The bloke is not a down and out cobber struggling against a unfair system. Nor is he a person with a disability and or mental illness that can be treated.
He is a sociopath with murderous intent. His sense of self entitlement is complete, sovereign citizen or not he would still be like this. He has jumped on the bandwagon to justify his actions, he would always find a reason to act this way.
Irrespective of the societal ecosystem, he would always be a angry defiant violent person.
I doubt he will surrender, instead he will try to murder police and feel self justified and see his actions as heroic.
I hope they get him alive and no more innocents are hurt. He deserves a life long cell with no opportunity to commit suicide.
Sadly is he is killed other nutters will see him as a matyr.