They've been following expert advice at all time. They could have taken a punt on things against advice, but that's not how large scale healthcare decisions work in real countries.
Again, not how large scale public health decisions are made (outside of joke govts like China and Russia).
So far I've only heard you and Trump advocate the use of this drug - that's not a great pool of minds to find yourself in.
It's not so much a question of whether or not it works (and we're far from sure of that), it's about the drug's interactions with other pre-existing conditions, other drugs, etc. It can't be used long-term, so when in the infection cycle to we introduce it? When is it safe to stop it? We know the answer to these questions when it's prescribed as an antimalarial medicine, not as an emergency treatment for respiratory distress.
Some people trialling a drug is a very, very long way away from responsible govts using it on a large scale.