A responsible climbing company should provide you with a competent medically trained guide. Tusker Trail does just that.
Kilimanjaro is an austere environment where accidents and death do occur. While no one can guarantee your safety, a well-trained guide can save your life in the event of a high altitude or emergency.
Each year 5-15 climbers die on Mount Kilimanjaro, and many more suffer high altitude emergencies. A lot of these problems could be avoided if all guides underwent high-altitude medical training and carried oxygen and a portable hyperbaric bag. Sadly, this is not the case. There are no minimum safety requirements for companies climbing Kilimanjaro, so very few guides undergo definitive safety training.