This is factually incorrect. Energy has nothing to do with bullet performance or the production of wound channels. That has been well covered in multiple rokslide threads. Two bullets can have the same energy and produce markedly different wound channels. And two bullets of the same construction in different weights or calibers will produce markedly different energies, but may require the same velocity to upset or fragment.
On the 22 Hornet, I don’t think anyone here is promoting it as a big game cartridge. But with the right bullet and under the right conditions (i.e. distance and shot selection limitations), I would be confident that it would cleanly and humanely kill deer. What that means is optimizing your bullet construction and impact velocity to produce a wound channel of sufficient depth and diameter to kill a deer.
So how exactly does that sound irresponsible to you? Honestly, I know a lot of people who think they are being responsible by arming themselves with guns they cannot accurately shoot that also fire bullets that are specifically designed to minimize wounding potential. Does that sound irresponsible to you? My definition of a responsible hunter is someone who puts in the time to make sure their equipment and ammunition is well chosen for the game, that it is functional and dependable, that they have practiced with that equipment to be able to use it well and understand its limitations, and that they stay within those limitations. What is your definition?