I live in the Chicago suburbs. You can find barbers who will give a shavette shave (a real straight is not allowed), but they are few and far between and quite expensive ($75 or more). I think the main issue is liability.

My barber said that they use to give shaves until one family brought in their elderly father for a shave. He couldn't sit still and he got cut rather badly. The barber was afraid of a lawsuit. Here in Chicagoland, juries tend to award outrageous settlements to plaintiffs, so liability insurance for barbers offering shaves is quite expensive. Most barbers decide that offering shaves is not worth the risk of being sued.

From a disease transmission standpoint, products such as Barbacide do a good job killing HIV, hepatitis, MERSA, etc. However, they are only effective if prepared and used according to directions. I suspect some barbers, beauticians, nail salons, etc. try to cut corners to reduce costs.