I think you are missing my point completely. Getting violent with another human being is a crime. If the other person is a prostitute, it is the same crime, and the nature of the crime has nothing to do with her trade.
If prostitutes were treated with honor as citizens, whrether male of female, in the way that, say, chiropractors are, their lives would be no more at risk than any other practitioner, or perhaps only slightly madly so because sex as a subject often has a lot of insanity tied to it. That aspect is genuinely a risk of the business. Psychiatrists have the same risk in a difgferent way, of running into nutballs or desperate people.
This is not likely to happen in a culture such as ours where sex has taken on such distortions of meaning and become tied to such heavy emotional packages, but that doesn't mean it is any the less true. The crime of prostitution is that it is criminalized, making criminals of those who practice it, whether as clients or vendors. This means that those who practice it are forced into the shadows.
Another aspect of this cultural blindness is that emotional intimacy is a great scarcity and an absence hard to heal in poeple's lives once the starvation starts dictating behaviour. In a different world, those who healed people by filling emotional scarcities might be considered rare heroes.
I have never paid (explicitly and directly) for love or sex; but I have known some who sold it, and more who bought it, and they always struck me as people whose deficits -- especially the buyers -- were primarily emotional rather than physical. Just an observation.