The role of government is not all about the individual, but also about our collective welfare:
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America. Preamble to the Constitution
Perfect Union: Obviously not purely about individual rights
Justice: Not purely about individual rights
Domestic Tranquility: Not purely about individual rights
Common Defense: Not purely about indivdidual rights
General Welfare: Definitely not purely about individual rights
Blessings of Liberty: If liberty is to be a blessing, it is not just about individual rights.
It is telling that there are even Catholics who think that we are a country established to protect the Almighty ME. We are not, and we cannot be, or we are doomed to fail as a nation.
OP, show your mom the Preamble to the Constitution, and ask how we can realize that ideal without morals.