The only logic is that the government is trying to keep up the illusion that our fiat money coinage is worth something. Because government has inflated the money supply tremendously, it is in a bind trying to make coinage at a lesser cost than the face value. They have run out of options with the pennies and nickels. As cheap as they make them, the metal value is worth more than the face value.
Back in the 1960s, the government took all the silver out of dimes, quarters, and halves. They stopped making silver dollars. All those coins are now the cheap sandwich coins. Actually, since they have no precious metal content, they should properly be called tokens instead of coins.
Now, an old silver dime is worth MANY times the face value in melt value.
Save your pennies and nickels.