Over the last decade, citizens of Zootopia have been calling for the reintroduction of the death penalty as a way of stemming increases in crime. Assume that Zootopia is a state in the Commonwealth Caribbean that has signed and ratified the International Covenant on Civil and Political Rights (ICCPR) but has refused to sign the Second Optional Protocol to this treaty. A Zootopian citizen, Mr. Money, was given a death sentence after he pleaded guilty to multiple counts of lottery scamming. He has been on death row for the past six years. Amnesty International has argued that Zootopia does not have the right to use the death penalty after signing the ICCPR and has further suggested that Mr. Money's sentence is contrary to previous rulings by the Privy Council.

Question:

Carefully assess the legality of the use of the death sentence by Zootopia in this case and comment on the validity of the arguments put forward by Amnesty International.

Please explain in depth, and as thoroughly as possible.