True, but look at what they did to a leader of a rebellion. Phlegethon was captureed made to be that tall, brainwashed and then forced to guard the labrynth. They also seem to be fine with death of test subjects. Xande went as far as make a pact with the Cloud of Darkness. To me even a advanced culture as they were they should have known playing around with a being like that is tricky at best and deadly at worst.