The preamble to our constitution says:
We the People of the United States,
1. in Order to form a more perfect Union,
2. establish Justice,
3. insure domestic Tranquility,
4. provide for the common defence,
5. promote the general Welfare,
6. and secure the Blessings of Liberty to ourselves and our Posterity,
do ordain and establish this Constitution for the United States of America.
Those 6 things are enshrined in our constitution as the purpose of our government. no pick and choose