Replace "government" with "society" (and centuries of moral philosophy too).
If all good/bad decisions were made by individuals, we'd basically have anarchy and rule of the strongest - as most people would probably decide that "good" is what benefits themselves and their close friends.
All decisions are ultimately made by individuals. There is no such thing as a group. Decisions made by a “group” benefit some and harm others that disagree. It is literally impossible to arrive at an ideal situation when you poll a group. Every individual has unique needs.
If all good/bad decisions were made by individuals, we'd basically have anarchy and rule of the strongest - as most people would probably decide that "good" is what benefits themselves and their close friends.