What do you think is the best argument for Proclamation of 1763?

The best argument for passing the Proclamation of 1763 dealt with issues of security and safety. The British had just gained a lot of land from the French as a result of the peace treaty ending the French and Indian War. Most Native American tribes were very friendly with the French. Many tribes weren’t pleased that the British had gained this land. They were concerned the British were going to try to take away their land. When Pontiac’s Rebellion occurred, it sent a message to the British that there might be conflict in the land that the British had just received from the French.
As a result, the British passed the Proclamation of 1763. They wanted to protect the colonists from potential attacks by the Native Americans. Thus, this law said the colonists would not be allowed to go to the area that the British had just gained from the French. The British believed if the colonists stayed out of this area, they would be more secure.
Of course, the colonists didn’t like this, and they felt the British were trying to control them. This law, along with other laws that were passed later, eventually helped lead to the start of the Revolutionary War.
https://www.ushistory.org/us/9a.asp