Remember, the government isn't going to disarm. There's no fantasy world you can imagine where the government gives up their weapons. So your plan only ensures that the direct power of the government increases exponentially relative to the citizens.
Let's consider our current President, Donald Trump. He's literally Hitler, right? And you want him and his henchmen to be the only ones armed? What happens if he decides to build that wall and deport every person of Hispanic descent? Maybe build some camps to expedite the process? Then declare martial law and make it illegal to gather and protest? You already believe he would do these things. If you've had all of us line up and turn in our guns, what's your plan when the new Emperor of North America is no longer responsive to polite letters and protest marches in pink hats?
First history lesson:
Germany disarmed their citizens in the 1930s. Went so far as to make it a death penalty offense for a Jew to be caught with a firearm in a follow up law in 1938. It made it a lot easier to kill those same citizens by the millions less than a decade later. The only reason there is a living Jew anywhere in Europe today is that lots of American (and some British and French) boys took guns and went to Germany and killed Nazis until the remaining Nazis decided to quit being Nazis and stop killing Jews.
If every adult Jew had illegally kept a gun and instead of getting in the cattle cars, had shot one Nazi, the Holocaust would not, could not, have happened. The Nazis were only capable of committing the evil of mass murder because they successfully committed the evil of disarming their victims first.
Second history lesson:
On 19 April 1775, the main reason the American colonists decided that this was the day to make a stand against 700 British Regulars at Lexington and Concord was that the British were marching out to disarm the colonists, to confiscate their muskets, powder, and shot. The colonists refused and successfully defended their weapons and supplies. The birth of the United States is a violent response to an attempt at disarmament.
Another fun fact from that 19th of April. One 78 year old farmer from the area, Samuel Whittimore, is remembered as the State Hero of Massachusetts for his actions that day. He had missed the main battle and only heard about things when the British were retreating back toward Boston. He could have stayed out of it, the battle was essentially over.
Whittemore was in his fields when he spotted an approaching British relief brigade under Earl Percy, sent to assist the retreat. Whittemore loaded his musket and ambushed the British Grenadiers of the 47th Regiment of Foot from behind a nearby stone wall, killing one soldier. He then drew his dueling pistols, killed a second grenadier and mortally wounded a third. By the time Whittemore had fired his third shot, a British detachment had reached his position; Whittemore drew his sword and attacked. He was subsequently shot in the face, bayoneted numerous times, and left for dead in a pool of blood. He was found by colonial forces. He was taken to Dr. Cotton Tufts of Medford, who perceived no hope for his survival. However, Whittemore recovered and lived another 18 years until dying of natural causes at the age of 96. (excerpt from Wikipedia)
Patrick Henry's famous speech was given a month later. You should read the whole thing.
What is it that gentlemen wish? What would they have? Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!
--Patrick Henry, St. John's Church, Richmond, Virginia, March 23, 1775