I chose to have a C-section. I have OCD and simply couldn't cope with the unknowns of vaginal birth. I spent my entire pregnancy quite mentally unwell and crippled with anxiety about still birth, shoulder dystocia, birth injuries, oxygen deprivation for my baby, etc.
Knowing I had the option for a C-section, despite there being no physical medical reason to need one, helped me cope. Forcing me to go through a birth I would have been petrified of would have been traumatic. I needed the known and controlled environment that comes with a section.
Women should absolutely be allowed to choose an elective section. It would be a slippery slope imo to start opposing women's birth choices, or making some people pay privately. Most midwives and consultants will encourage a vaginal birth in the absence of medical reasons. They encouraged me, but I made a fully informed choice and do not regret it one bit. Most women want a vaginal birth anyway. The amount of women choose a section for 'no reason' will be very few.
Also, the risks of sections are spoken about frequency. Most women are aware of them. The riska of vaginal birth imo are not spoken about. It's not often you'd hear professionals talking about the risk of things like cord compression, permanent incontinence, severe tears, the risk of forceps, etc. All information should be available on both options, and women should be able to pick.