[CryptoPunk]

Obviously there are risks involved in occupations involving contact, as your allusion to priest sexual abuse scandals references, but people need human touch.

How much depression, suicide and drug-abuse is caused by the desire to tightly control commercial human contact and the resultant dead-weight loss of people not getting enough of it?

Unless there is a pressing public health threat from an activity (e.g. someone who doesn't know how to drive, operating a motor vehicle on public roads), society should think very long and hard before restricting people from engaging in that activity.

If there is going to be licensing, it should be limited to restricting how people can market their skills, where only those licensed can market themselves as licensed. This gives quality-conscious consumers an easy way to identify licensed practitioners, while giving those who value affordability over safety the option of unlicensed services.