Wooh, boy, you're opening up a huge can of worms. I don't think there is any topic in this hobby that engenders such strong opinions as hybrids, particularly among cichlids. There is a very large and vocal sect of hobbyists that shout vehemently that "man made monstrosities" have absolutely no place in the hobby, arguing that such hybrids very often display artificial colouration, have unhealthy deformities, and/or are contrary to conservation efforts. I personally disagree just as strongly, and believe that aquarists should be allowed to keep whatever they like.
Its very, very strange (to me), but the anti-hybrid sentiment seems focused only on a handful of hybrids and artificial crosses (e.g., parrot cichlids, super bright peacock crosses, and flowerhorns). Domestic angelfish and discus are almost certainly hybrids, and you can't tell me that a Red Marlboro discus is any less unnatural than a Red Parrot -- or, for that matter, an electric blue veiltail ram, a red koi angelfish, or a super red apisto cacatuoides (and don't even get me started on the hybridisation in non-cichlid fishes!). Yet, these unnatural fish are sought after by hardcore hobbyists.
One of the greatest problems I think we, as a hobby, have is condescension. We have a serious problem with growing and keeping people in the hobby, and there's no quicker way to drive people away than to say, "My fish are somehow better than yours." "Those aren't real fish, you aren't a real hobbyist, you're a newbie," or all of these other variations. This attitude pervades certain segments of the hobby, and it has actually chased even me out of certain clubs. We need to be welcoming to hobbyists of all sorts, whether they're keeping and breeding red brick swordtails or fish with eighteen syllable, Latin names.
One of the most hated fish in the hobby is undoubtedly the GloFish. I've told this story a lot of times before, but I'm going to tell it again. GloFish danios are, of course, genetically modified zebra danios that contain a gene to create a fluorescent protein found in certain marine cnidarians. They're incredibly useful for bioassay and other genetic research, and they've found a huge market among the aquarium industry; you can find GloFish at virtually any pet store, except those that have decided that people who want to keep them are somehow lesser aquarists... (That harmful, supercilious attitude again). I will admit, I didn't like them. They're gaudy, and the idea of a GM fish didn't sit well with me.
Years ago, when they were still new, and I had that attitude, I was taking care of tanks at a long term care facility for seriously ill children. You'd get that one kid every so often who was really excited about the fish tank, and would talk to me every time I was there for 3-4 months, and then ... just wasn't there anymore. And you wouldn't want to ask where that kid went, because "home" wasn't always the answer.
Well, anyhow, the place had a couple of fish tanks scattered around, one of which was a tank tucked in a corner of the a playroom. This playroom was intended for fairly young kids, and the tank was... well, the tank was an after thought. It wasn't on the main floors or hallways, it was out of sight, and it was neglected by the staff. They had more to worry about than fish tanks, and this one was "out of sight, out of mind," so I would sometimes have to replace the fish in it when, for example, the fish food container hadn't been touched for a month.
One day, I was coming up the stairs, and from about 30 feet away, I could see the tank. And in the tank was this pink... thing. It was BRIGHT PINK, and even though it was barely an inch long, I could see it. It was a GloFish. Some kid had talked his parents into buying an effing GloFish and sticking it in my tank! A bright pink GloFish. Well, I'm not going to leave this kid's little fish to stress alone, so I went out to get some regular danios for it. On a whim, I bought a dozen or so GloDanios instead -- the little kids would like it, right? (This was somewhat painful, fish came out of my pocket, and at that time, they were $18 a fish!). Now, tell me, who's going to tell a sick kid that his fish are unnatural monstrosities and don't belong in the world?
Wouldn't you know? That tank went from being the neglected corner tank to the most popular tank in the place. It *always* had kids around it, and I'd get calls about it. Not just care calls from the centre, but calls from parents and others, "Hey, I saw that tank, and they told me to call you to ask about it... how do I do that at home?"
I've seen the same effect with the bright red parrots -- though never so extreme. They're bright, they're hardy, they're personable, they're intelligent, they're reasonably peaceful. What more do you want from a fish?
How many people have seen a really awesome brightly coloured fish like a parrot or a GloFish, or wondered what the heck is up with the giant kok on a flowerhorn and decided to keep them? How many of those people now have 48 tanks in their basements, and might be breeding critically endangered goodeids?
How many of these potential people showed up at some fish club and had a bunch of arrogant jackwagons drive them away with torches and pitchforks because they're keeping "those" fish?