Raccoons are easier to rehabilitate than some species certainly. However, they do carry a number of diseases and parasites that are indeed contagious to humans and other pets. These include, but in no means are limited to: rabies, canine distemper, raccoon parvoviralenteritis, infectious canine hepatitis, pseudorabies, coccidiosis, trichinosis, tuberculosis, toxoplasmosis, listeriosis, yersiniosis, pasteurellosis, tularemia, and leptospirosis. Proper cleaniliness must be maintained to prevent this, as well as minimizing exposure to feces. Additionally, to rehabiliate a raccoon to be released and survive in the wild, does take a great deal of care and attention to detail. They must learn to be independant, and over time learn to NOT trust people, otherwise it is as good as signing their death warrant. They must be taught to forage for food, as well as to socialize with their own kind.
Each year, many raccoons are mistaken for being "rabid", simply because they are a bit too social with humans, who mistake this for rabidness and it leads to certain death. They can not depend on people for their food or shelter as adults, or they will not thrive or survive in nature.
Also let me add, that "raising coons", and rehabiliting them are not always one in the same. Rehabilitors go thru hours of training to learn to properly raise their charges in order to ensure a succesful (and permanent) release. They also know the risks involved, and how to take proper precautions. The point is, not everyone should "have a coon", just for the sake of doing it, and those who improperly rehabilitate and release, are doing more harm than good. Anyone who does wish to become involved with them, needs to do so with a reallistic concept of how to do it, and what to expect, as well as what potential risks are involved. Also to answer your question, I personally bottle fed and weaned 16 infant raccoons last season, and assisted in the rehab and release of 35. 6 of these were released near my home so that I could oversee their release, and ensure that as they learned to forage and expand their areas, that food would be available.