Ethical masturbation does NOT refer to a literal act of masturbation performed ethically, rather, it refers to an act of self loathing and self deprecation done with the goal to ease one's mind, it is often done as follows (conversation example):
Ethical masturbator: oh no, big bad me did a big bad thing
a normal person: maybe do something about it, then?
Ethical masturbator: no, I will just sit here and talk myself down so that I feel like I have been true to myself and so I won't feel guilty about something-bad-that-I-did/something-bad-that-just-happened-on-it's-own even despite the fact that I did nothing to fix it.
another form of Ethical masturbation is doing the same exact thing but rather than just indulging in self-loathing, one might also start asking supernatural entities (gods, spirits, ETC) for forgiveness
just saying that you are bad won't fix things, it's not remorse - it's Ethical masturbation