Just to avoid confusion: there are two uses to which this (and other retouching software) is put:
1. for retouching, i.e. removing pimples and unsightly blemishes, stray hairs, and I'd also include contrast adjustments, fill light etc.
2. changing the underlying shape of a face or features to conform to an image that does not correspond with how the subject actually looks.
For (1) this software is a useful tool. For (2) this is where ethical considerations apply. Silly to condemn the software for (1). Not so silly to condemn it for (2) - but it does depend on the circumstances, as I outlined above. Generally I am reluctant to noticeably change appearance. No desire to encourage insecurity or image-envy, particularly with young people (mostly females, but increasingly males as well). But each circumstance must be treated on its own merits. An accurate picture of one of my close friends who is 60 yrs old female and suffering cancer, would do much more damage to her fragile self esteem than a retouched one.