The 2nd Amendment isn't there so you can protect yourself against criminals. You already got the government (the police force) for that. It is also not there so you can go hunting (though you can use it for that).
The 2nd Amendment is there to divide and distribute half the power to the people and half to the government.
Did you know that the Ten Amendments, are the second part of the Constitution? The first part of the Constitution gives power to the government, while the second part of the Constitution gives power to the people.
Your ancestors fought and died so that 50% of the power will be given to the people. So that the document will be divided into two parts: the Constitution itself (for the government), and the Bills of Rights aka the 10 Amendments (for the people).
So why do you want to abolish your part of the constitution and give all the power back to the government?
It's would be as illogical as Congress deciding to abolish all its power and give them all to the Executive Branch.
The point of the Constitution is to divide and distribute power between the branches, between the federal and the states, and between the government and the people.