"We never run a computer program unless we know an important fact about the output and we don't know the output," said Marcello Herreshoff.

That's a fallacy - as I have previously explained on Overcoming Bias: we do not just run computer programs to learn things we also run them to do things.

For example, we use computer programs to automate common tasks. Say I want the numbers from 1 to 100 printed down the left side of a piece of paper. It would be reasonable to write a Python script to do that. Not because there is something unknown about the output, but because a computer and a printer can do it faster, better and neater than I can.