because the memories are still fresh. of being a slave of not being treated like a sentient being of being worked hours on end without rest and there only food being some bread and water and maybe if they are lucky some rat meat. they still remember the stories of slaves used as living containers. butchered by there masters over wrapped moon sugar that they where forced to swallow so that the guards wouldnt find it . sure the only person that was shown in morrowind that this almost happened to was rabbina but more then likely a few argonians underwent this horrid ordeal only to meet a slow painful end at the blade of a knife. and walking the streets knowing that the guards will likely do nothing about it if you are taken as a slave or killed simply for being argonian.