Without those studies, how are we supposed to know if a drug or vaccine actually works? Just because a drug cures an animal of a disease does not mean it will do the same in humans. There are many drugs that work very well in rodents or monkeys that do nothing for humans.
There is a big problem in trying to test if Ebola drugs or vaccines work in humans. The problem is that we cannot expose people to Ebola to see if a drug or vaccine works. Politics and funding have nothing to do with this.
My supervisor thinks we should test these things on prisoners. I'm sure many people would agree with him. However, ethics committees (and probably laws) would prevent such testing.