Article I, Section 8 of the U.S. Constitution enumerates the powers held by Congress. Among those is the power
To promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries;
Determining the Length of Copyright Protection shows when copyrights expire, given the state of current copyright law in the United States.
What public good or progress in science and useful arts is served by copyright law that allows copyrights to last decades past the death of the creator, or at least 95 years in the case of works for hire?
Seriously. What do you think?