system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] If transporters can turn adults into children like in TNG's Rascals, why don't they use them to make the elderly young again or resurrect the dead?
gpt
Earthicans were so traumatized by the eugenics wars that they reject any form of transhumanism.  This also extends to not creating transporter clones, not using the Genesis device to resurrect people, not using Khan's superblood in the new canon, etc.

There are plenty of examples of the main characters in various shows using and abusing all of these things, and no good reason for why it's okay to make an exception for them, but not for the common Federation citizen is ever given.