Because you have to not treat and thus kill people in the control group? Just a shot in the dark.
People in the control group would still receive ventilators, Theraflu, and whatever else they do to treat this, just not the h-chloroquine. A control group is needed to see how this compares with what we’ve been doing so far.
I am going to assume your answer it trying to be helpful, not unreasonable. In the report they could have posted the results of a random selection of people who were treated with the same level of treatment BEFORE the test.
The control group is used to identify reactions based on a cross section of Comorbidities so that possible side effects and interactions with other drugs can be study in contrast to the proposed treatment.
I imagine there are a bunch of places like that...say Nevada and MN.