Chloroquine has side effects and the drug might not work. It'd make the front blinds a hell of a lot worse if we start giving people whatever without any scientific basis just because one charismatic scientist has been pushing for it. Ignoring the science is what got us here. Staying blind to science to pursue false hope isn't going to get us out of here. Remember how during Ebola we were all convinced that drug by Gilead was going to work since it seemed to have an impact on the mechanism of action etc etc? Remember how it failed after rigorous studies? Imagine if we'd just decided it worked without testing it on preliminary data and given it to people on the front lines to protect themselves.

These regulations are written in blood. Dengue vaccines are another example. Ignoring science got us here. Ignoring science again will keep us here.