Medical science is difficult. There are many failures and frustrations in the researches. Furthermore, people are only looking for cure. They do not want to accept the fact that any treatment might come with cost of lives. Some might consider a lot of research methods abnormal or even inhuman. However, that is how all the medicines created. There is no pill that does not come with blood. Are you going to quit taking it because of that when you are sick? Focusing on this is just meaningless.