Oh, you have bit of hitler syndrome. Some liveforms are superior to others. His(hitler) was about races or country origin.
I have to wonder what makes a leopard gecko superior to a mouse or cricket, or the esteemed roach(a long history of survival on earth)
I have an ozzie book that has a pic of a diamond python eating a baby LACIE. Dude whats up with that. Those python people are nuts. Oh, I have a pic of a whitethroat eating a woma. Dang us monitor people are nuts.
Heres the deal, monitors eat what they eat. If they were wild, they WOULD EAT WHAT THEY EAT. Without judgement as to is commerial value or its emotional value to humans.
Gouldi/rudibus consume baby perenties, ackies consume kings monitors and brevicauda, Perenties consume all manner of flavis, babies and adults. All consume all manner of rare and common geckos. A friend found a undiscribed monitor in the stomach of a V.tristis, I found an undiscribed monitor in the stomach of a V.gouldi.
The point is clear, if something holds value to YOU, do not feed it to a monitor. If it does not hold enough value to you, to keep it alive, then if you wish, feed it to a monitor. Remember, the captive monitors, HAVE TO EAT SOMETHING.
In captivity your only a servant that brings the monitors their food. Its the monitor/s that are judging whether its food or not.
Remember, by human made tests, a mouse is superior to a lizard, they are smarter(work a maze better) are more successful(larger range, invaded more habitat) etc.
If you do not like seeing reptiles eating other reptiles you like(hold a value in) don't do it and don't watch it. But don't tell others what they should do. See, that fits that hitler thing too. The hitler thing is, holding value(as superior) to a certain type of something, then encouraging/forcing others to do the same.
A story, a couple of years ago, I acquired a pair of Vine snakes, I always wanted to work with that species. I got small vine snakes. Vinesnakes eat lizards. Thats what they do.
So I fed them lizards. For some reason, they did not consume these two lizards, so I fed those lizards crickets. They grew up and were a sexual pair. So I started thinking those feeder lizards would copulate and breed. Then the stupid vinesnake ate one, then the other. I got rid of the vinesnakes, I like the lizards better. But thats just me, and for now.
I do agree with you, I would rather keep a leopard gecko then a roach or cricket or mouse or superworm. I don't like roaches what so ever(my wife forced me to think that way) so I do not feed them to monitors. Cheers