A prosecutor was working with police in a standoff between a triple murderer and

A prosecutor was working with police in a standoff between a triple murderer and police.  When the murderer demanded to talk to a public defender, the police did not want to have a public defender get involved, so the prosecutor pretended to be one.  He spoke with the suspect on the telephone and lied about his name and being a public defender; the man then surrendered to police.  He was sanctioned by the state bar for misrepresentation and was put on probation and required to take twenty hours of continuing legal education in ethics, pass the Multistate Professional Responsibility Examination, and be supervised by another attorney.  Do you think he did the right thing?  Why or why not?
Are the following actions of a prosecutor legal? Are they ethical?
Authorizing the arrest of one brother for drugs (knowing the young man would lose a scholarship to college), even though the prosecutor knows the charge would be thrown out, in order to have leverage so that he would give evidence against his brother.
Announcing a suspect of a drive-by shooting to the media so that the offender is in danger from the rival gang members, and then offering protective custody only if the man will plead guilty.
Authorizing the arrest of a 10-year-old boy who confessed to a crime, even though there was no serious possibility that he was guilty, in order to pressure a relative to confess.