non-Jews who wanted their boys circumcised for whatever reason but wanted it done humanely chose a mohel for their skill.
I don't want to argue too much with anecdotal reasoning, but I can tell you most Gentiles do not choose a mohel. They choose a doctor. For his skill and his knowledge!
I'm talking about parents like ourselves that used midwives rather than doctors. They are less likely to circumcise anyway and explore other options if they do.