Why would you consider that not to be normal? Humans have plenty of inherent physical flaws - we have terrible backs and knees, for example. Also, plenty of other countries have similar adoption of ADs.
There was no magic beforetime when we were all happy peasants or hunter-gatherers, singing in the countryside. Humans have always lived with pain and depression and suffering, and to pretend there's any moral good to that is ridiculous, no more than there's any moral good to dying from an infection. Dying from infected wounds is "normal". Being permanently crippled from breaking a bone is 'normal".
People are so weird about things that actually help others.
There was no magic beforetime when we were all happy peasants or hunter-gatherers, singing in the countryside. Humans have always lived with pain and depression and suffering, and to pretend there's any moral good to that is ridiculous, no more than there's any moral good to dying from an infection. Dying from infected wounds is "normal". Being permanently crippled from breaking a bone is 'normal".
People are so weird about things that actually help others.