In many cases euphemisms are expressing hypocrisy. What used to be ' charwoman or man' is now, at least in this part of the world, called ' interior caretaker' . This tells that their status went up , but their wages didn't.
A forklift driver is called ' logistic assistant' for the same reason. What we (overhere) used to call 'heavy criminals' now are called ' top criminals ' placing them level with ' top lawyers', ' topmanagers' and ' top artists'.
This actually may be not a euphemism.

The garbadge man is still called garbadge man, thanks, but for how long?