Whether it was brought in, or has been periodically wiping out isolated toad populations for yonks, the problem was the chytrid fungus was spread from colony to colony, and then around the world, by researchers who failed to take basic quarantine precautions. Even when they washed their clothes, theirs boots, belts, hats etc had the spores. They drove from one colony to the next without steam-cleaning their vehicles.

Its basic and fundamental: if a population of something, anything, gets mysteriously wiped out, and you go to research the cause, assume it is something contagious before you tromp off to hitherto unaffected colonies. Apply quarantine procedures before going anywhere else.

The tragic fact is these clowns were so convinced global warming was cause, in the absence of any proof, they took no precautions, and spread the chytrid fungus around the world. Very simply there is no place for idealology when it comes to this type of situation.