You don’t know what the 2nd Amendment was for

Plain enough, if you know any history:

Connecticut 1818: Every citizen has a right to bear arms in
defense of himself and the state.

Kentucky 1792: [T]he right of the citizens to bear arms in
defense of themselves and the State shall not be questioned.

Massachusetts 1780: The people have a right to keep and to bear
arms for the common defence.

North Carolina 1776: [T]he people have a right to bear arms, for
the defence of the State; and, as standing armies, in time of
peace, are dangerous to liberty, they ought not to be kept up; and
that the military should be kept under strict subordination to, and
governed by, the civil power.

Pennsylvania 1776: That the people have a right to bear arms for
the defence of themselves and the state; and as standing armies in
the time of peace are dangerous to liberty, they ought not to be
kept up; And that the military should be kept under strict
subordination, to, and governed by, the civil power.