True, and as Protestant Christians confessing a sin does not mean you get off scott free, you still need to make amends or answer to justice. When a serious crime is committed the pastor should council the person to give himself up and confess to the police then do it himself if this person does not turn himself in.
He needs to not just shepherd this one man but his flock and the community as a whole from further damage or danger.
Only if that's your agreement ahead of time.
I am absolutely honest about what will and what will not be confidential. I will tell a person that if they have done x,y,or z that I must report if they tell me.
If they reveal, I'll encourage them to self-report and I'll go with them.
But I'll not give the impression something is confidential and then play "gotcha" with a person. That is a violation of confidentiality AND of integrity.