For the United States, the Constitution gives certain goals for the government in the preamble:
To form a more perfect union - Make it so the people of different states can conduct business, make contracts, have compatible laws.
Establish Justice - Criminals get punished. No running between states to avoid prosecution.
insure Domestic Tranquility - Enact such laws that allow people to live peacefully with each other. Provide institutions that enforce laws (Police, Courts, etc)
Provide for a Common Defense - Establish diplomatic capabilities for the whole of the union, establishment of a military.
Promote the General Welfare - See to the needs of the people. This includes making health care available to enabling charitable causes.
secure the Blessings of Liberty to ourselves and our Posterity - The government is intended to provide freedom. In essence, this is a 'do no evil' kind of statement. (Posterity - Those who come after us... eg. Children, Grandchildren, etc)
They're right. That is the point of (the US) government. I don't see "provide tax breaks to the wealthy" or "corporations play for free" in there anywhere. Hell, I don't even see "protect unregulated capitalism." Unregulated capitalism is evil, greedy, and wrong. But I suppose when you support a fascist theocracy, evil, greedy and wrong are small potatoes.