There are reasonable animal rights supporters.
They work for things like clean, comfortable and healthy lab conditions, rules on anasthesia and procedures, reducing unnecessary pain or discomfort for animals, finding workable alternatives for live animals, supporting non-medical products that don't use animals for testing, and other things that recognize a legitimate need for animal experimentation and testing, but make it as good as possible for the animals.
PETA and those like them are, frankly, nuts.