I have a cure for Kepral's syndrome. If you're so dumb that you eat all the food on your own crappy planet, and then get rescued by supposedly big stupid jellyfish to live somewhere else, you should probably wear at least a re-breather or something if your new environment is so bad for your lungs. Hell, maybe even an envirosuit.
Actually, the Drell lost Rakhana to overpopulation, infighting over what remained after the depletion of all natural resources and severe environmental damage caused by unchecked industrial pollution. Still their fault, but given how Earth's prospects are in the real world when it comes to these same issues, I don't think we can judge them too severely. And for all we know, maybe the Drell had climate change deniers in power on Rakhana?
Anyway, it's not like the Hanar are exactly smart here either. Who honestly thinks that taking a people who evolved on the equivalent of Tattooine, would at all do well to be dumped on planet Waterworld, rather than finding a uninhabited world like Arrakis that is more suitable for them?
As much as the Drell think the Hanar did it out of charity, it seems way more like the Hanar's true motives were because they wanted a client race that could do the heavy lifting and were extremely loyal to the Hanar for saving them from extinction.
Of course, that doesn't explain why the rest of the Council were simply twiddling their thumbs during all this, why didn't they life a finger to help? It's not like the Drell did something to tick the Council off, like the Quarians had with the creation of the Geth?