Yes, they actually intend to kill off at least a substantial fraction of humanity. Yes, they intend to do it by fair means and by foul. Yes, they want everyone who doesn't like them dead, preferably painfully. The first principles of animal rights activism include the idea that humans should voluntarily choose extinction to protect the lives of other animals.
If you watch their statements on Internet forums and in print, they actually say it. In conversations face to face or avatar to avatar they actually lie about it even when they know that you're read what they wrote. Some of the lies are like "I didn't actually mean it that way." How did they mean it when they said nine tenths of humanity should die, or that the owner of a dog should die horribly?
What is the meaning of a message like this?
"Rest in peace my Angel.
Schuler you ****ing bastard I pray to god that your time is soon and that you burn in hell! " Pretty clear, isn't it? This one was about a dog who the vet and the humane society checked and was doing just fine.
Here's another good one:
"If I were reincarnated I would wish to be returned to earth as a killer virus to lower human population levels."
-- Prince Phillip, Duke of Edinburgh, leader of the World Wildlife Fund
Proud sponsor of Jane Goodall, by the way.
"Isn't the only hope for the planet that the industrialized civilizations collapse? Isn't it our responsibility to bring that about?"
-- Maurice Strong, head of the 1992 Earth Summit in Rio de Janeiro and Executive Officer for Reform in the Office of the Secretary General of the United Nations
"Among environmentalists sharing two or three beers, the notion is quite common that if only some calamity could wipe out the entire human race, other species might once again have a chance."
-- Richard Conniff, Audubon Magazine
More environmentalists, but the movements are not separate now if they ever were. There are a lot of quotes at the "Target of Opportunity" website.
These people warn us of the danger of "exotic" pets and some domesticated pets. They use the warnings as leverage, the danger as a trump card, to pry our animals, our property, away from us, for public disuse without compensation. This also is part of a plan to eliminate humanity from the picture.
It's a form of suicide. It's common knowledge that they're angry with humanity for messing up the world, and for doing what other animals do: exist, use our brains, eat what we need to eat, and change the environment to be more useful to us. Ironically humans are animals so you can't hate humans without somehow hating animals and life. All the warnings that we've tainted them, that we shouldn't have them living with us, they are aimed at killing the bond between humans and animals, denying the animals the benefits of relationships with humans, and denying humans the life that we share with the animals.
When they are banning particular animals as pets, they deny homes to those animals. This matters because in doing this they prevent people from repairing or mitigating the damage that they are so upset about. It would cut into their charitable donations if it came out that owners of pets and livestock had created a larger, more stable population of non-human animals than would have existed without them, with greater safety, using fewer government hand-outs and bail-outs. The conservationists risk the extinction of a lot of species by attempting to end private ownership, and the best thing for increasing the number of a species is to make it a commodity that people will buy. This is at least as good a deal as unassisted nature provides.
The bottom line is that it seems like we could come pretty close to saying that the average environmentalist/animal rights activist is more dangerous to more humans, individually, than all of the exotic and domesticated pets on the entire planet. You might be able to count the livestock too. This is if you count animals as a danger, just for the sake of the argument. The truth is that animals are by far of net benefit to humanity, and humanity is of net benefit to the animals. Thus it is beyond doubt that every single animal rights activist is more dangerous to humanity than all pets and livestock. They don't want humanity to save the planet. They want humanity to die out and save the planet by not being here.