Police state or welfare state???

Jehanzb, accused is a heroine addict who fired on police and make arrangements to flee from the spot while police killed his younger brother...
Could somebody answers these questions.
1. Can we hold a person responsible for criminal act of another? 
2. Can we apply vicarious liability in criminal cases? 
3. Let suppose that the brother of accused and his family are both co accused then too, can police kill them without proper investigation and trial?
4. Police played a role of investigation, prosecution, adjudication and finally declared their verdict , found him convict and killed him. 
5. Where is the right of defence??
6. Where is the right of trial?
7. Where is the right of citizens to be dealt with according to law??

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