If you were a member of the British Parliament tasked to write a response to the Declaration of Independence at the time it was written, what counterpoints would you write in reply?

The Declaration was essentially an assertion of the right of revolution, and its rationale was based on the idea that the American colonies had borne such a "long train of abuses" by the British that they could no longer remain British subjects. Of course, most politicians in Britain denied that their colonists could do such a thing. It should also come as no surprise that members of Parliament and King George III himself issued public responses to the Declaration, as did countless editorialists in British newspapers. In a speech to Parliament on October 31st, 1776, the king described the "daring" and "desperate spirit of those leaders [of the Revolution] whose object has always been dominion and power." So your essay might, as King George did, question the motives of the revolutionary leaders in an effort to discredit their cause. Another possibility would be to observe, as the famous writer Samuel Johnson did, that the supposed idealism of the colonists was meaningless when one considered the existence of slavery in their midst. Johnson asked rhetorically: "How is it that we hear the loudest yelps for liberty among the drivers of Negroes?" The Americans, one might suggest, forfeited any claims to be a bastion of liberty by their ownership of enslaved people. Finally, a member of Parliament might have pointed out that the colonists were among the wealthiest people in the world, and that they owed their prosperity in no small part to the protection of the British Empire. If this protection were withdrawn, the Americans would be at the mercy of Spain, possibly France, and various Native American peoples on their borders. Each of these arguments either were made or could have been made in response to the Declaration of Independence.
https://www.americanantiquarian.org/proceedings/44498108.pdf

https://www.history.com/this-day-in-history/king-speaks-for-first-time-since-independence-declared