It's not "I want to give away half my money", it's, "I want to live in a society where all people give away half of their money, and of course I am willing to be subject to that rule myself."
The purpose of government, if it can be said to have a purpose at all, is to cover those items where we're better off doing them but they wouldn't happen on their own due to various game theory considerations or just plain transaction costs.
The purpose of government, if it can be said to have a purpose at all, is to cover those items where we're better off doing them but they wouldn't happen on their own due to various game theory considerations or just plain transaction costs.