"Ethics" is overdramatizing it. The goal of a code formatter is not greatness, but adequacy, in a context where the code is a means to an end. They're particularly used in contexts where you may be sharing the project with people who don't care about formatting at all. Forcing me to work in or clean up the messes of my lazy co-workers is also, I would suggest, not very humanistic.

Feel free to not use one in your art projects.