Classical Liberalism: The purpose of government is to do those things – and only those things – which both must be done and which only it can do.
Democracy: The purpose of government is to do the things the voters ask it to do.
A classically liberal government in a democracy is asked to do something – anything – that it is not currently doing. If it accedes it is no longer a liberal government; if it refuses it is not a democratic government.
(This should cause more sleepless nights than it does.)
Classical Liberalism: Society has no right to compel its members to defend it.
Traditional public goods theory: Society’s members will not voluntarily defend it.
But if a society must be defended then it must compel its members to defend it. But then it is no longer a classically liberal society.
(This, too, should cause more sleepless nights than it does.)