There are many tangentially related ethical issues raised there as well. Every basis of morality assigns greater rights to a government to appropriate things from mere citizens, than other citizens have to take from one another. The government first appropriates the designs and perfects the title in itself.
Many people seem to be missing the point.
If the actions are moral for an individual extracting fonts, it is because, Congress has transferred ownership of the designs away from the designer. They take what Congress, the new owner, freely gives. The concept that the state has the right to perfect a person's title according to the concepts of law is, I believe, universal in governments everywhere. Artists must fundamentally be able to make the leap that if a font design belongs to the government, it no longer belongs to the designer. Their arguments make sense, and a lot of sense only if there is still ownership vested in the designer - which there is not.