"Ketamine has been found to increase dopaminergic neurotransmission in the brain"

This property is likely an important driver of ketamine abuse and it being rather strongly 'moreish', as well as the subjective experiences of strong expectation during a 'trip'. I.e. the tendency to develop redose loops approaching unconsciousness in a chase to 'get the message from the goddess' or whatever, which seems just out of reach (because it's actually a feeling of expectation and not actually a partially installed divine T3 rig).

Because people like getting high and look for justifications to do so.

Left, right or center justification, it's all the same.

But you're right.