because he wants to because it looks cool
The crozier is the staff used by a bishop.
Roman Catholic AnswerBecause they are following the rubrics for when they are to hold the Crozier.
A crozier
The pope does not have a scepter. He carries a crozier, the bishop's staff, which is a symbol of his office as bishop of Rome. All bishops have a crozier. It resembles the shepherd's crook.
Catholics perform confirmation. Also, Lutherans do. This is done by the bishop or pastor.
St. Nicholas is shown with the bishop's staff or crozier.
A bishop carries a Crozier (also may be spelled Crosier). A Crozier is shaped like a shepherd's crook. A bishop the head of a diocese bears this staff as "shepherd of the flock of God", e.g. particularly the community under his canonical jurisdiction, called a diocese (which is a group of parishes).
bishop
The bishop
Priest or bishop
Bishop
In Catholic Confirmation