SCOTUS has repeatedly ruled government is not obligated to protect an individual citizen unless she/he is custody.
The only one capable of defending an individual at all times is that individual and IMO that person is entitled to keep and bear effective, efficient tools to defend self as so clearly stated in some state constitutions.
Today, the most effective, efficient tool for self-defense is a handgun.
My opinion is firmly grounded in the words Pennsylvania used in its constitution adopted 28 Sept. 1776 before it ratified the U.S. Constitution on 12 Dec. 1787.
Pennsylvania said in its constitution, A DECLARATION OF THE RIGHTS OF THE INHABITANTS OF THE COMMONWEALTH OR STATE OF PENNSYLVANIA dated 28 Sept. 1776, "That all men are born equally free and independent, and have certain
natural, inherent and inalienable rights, amongst which are, the enjoying and defending life and liberty, acquiring, possessing and protecting property, and pursuing and obtaining happiness and safety."
Pennsylvania also said "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."
Because those rights were inalienable, PA's citizens could not have given those rights away when they ratified the U.S. Constitution.
PA ratified the BOR on 10 March 1790 and with contemporaneous knowledge of the Second Amendment, PA modified its constitution that took effect on 2 Sept. 1790 and retained its statements about "inalienable rights".
Vermont used almost identical words in its constitution of 1777.
For Pennsylvania, Vermont, and other states that declared self-defense is an "inalienable right" their citizens have that right protected by either the Second Amendment or the Ninth Amendment.
As of 2006, only Wisconsin, Illinois and Washington D.C. prohibit law-abiding citizens from legally using concealed-carry handguns for self-defense.