You're going to get plenty of opposing views on this topic. I personally have no problem with hybrids just as long as they are handled and dispersed responsibly. The problems occur when people sell hybrids as pure bred species. For those that are seeking specific fish, it can be very annoying to pay for a certain fish just to find out that it is not the fish that you paid for. Then when keepers have a certain species that they are breeding, hybrids in the hobby can ruin the bloodlines of their stock. All that being said, I have seen some beautiful hybrids in this hobby. There are some that I wouldn't mind having. As long as they are properly represented as hybrids and given or sold to other responsible keepers, I think that there is a valid place for them. No one can dictate what goes with another person's stock anyway. Even if it is a pain to witness, people will do what they want in the confines of their home. Hybrids can be accidental or planned, but in the end it all boils down to the level of responsibilty of the keeper.
, but you can promote your hobby with integrity by recognising those who share your views and practices, while respecting those who don't.