I have no problem with people killing animals to eat. I have most respect for people who make good use of much of the animal (e.g. Inuits) and less for the factory farming where they only use a small part (e.g. whales for perfume).
I'm not a vegan type who objects to meat on principle. I eat meat and don't fell too bad for it but most of the time I prefer vegetables. I'd rather my food didn't suffer on it's way to my plate.
If anyone is killing an animal directly to eat then I'm even more fine with that. But do it cleanly. Same for hunting - if it's part of managing a population of animals then I am OK with it as long as it is done in a humane way.
Humane. ... don't we almost judge our humanity by how we treat people and animals at the point of death?
The is no excuse or justification for the beating, boiling alive, skinning alive torture of dogs. It is inhumane. It's inhuman. It is sub-human.
Likewise the people who will hack off the tusk of elephants and rhinos and leave to creature to die a horrible death or it's traumatized young to suffer and die next to their bodies.
I don't know what I can do. I can't go to Africa and shoot a poacher. I can't "stop" buying ivory if I've never bought it before. I can't do anything can I?
But I can refuse to take part in any pro-china messaging and tell the world that I think they are sick for doing what they do and not making it illegal. I can say "sorry, china - I'm not buying anything you make while you are tolerating these crimes".
Yes, there is a difference with all the things you describe - most civilized countries have some rules so if people are being cruel then they are breaking some form of laws.
The way to protect endangered species is to make the trade illegal and to have severe punishments for them and embarrass anyone who tolerates it. Seriously, I would be happy to see people executed rather than have them cause such harm to such intelligent animals.
Developed civilizations have to put pressure on developing people to make it clear what is and isn't acceptable and I think trade and publicity are valid weapons to do this. Part of that is making people aware of what is going on so if they are thinking of buying a product they can make sure they are not supporting a cruel regime in doing so if they so chose.