Wild animals don't commit murder. A wild animal killing a dog or cat is not an animal committing murder, it's an animal engaging in its natural instincts and finding food. A wild animal does not know or care that its prey is someone's dearly loved pet, it is just hunting the same way it would hunt for a rabbit or squirrel. There is nothing malicious about a coyote eating a cat or a cougar eating a dog; it's just nature that happens to affect people more closely.
It is devastating to lose a pet that way, but there are precautions you can take and at the end of the day, you cannot hate an animal for just doing what it needs to do in its own home. You have to remember that these are creatures choosing between starvation and survival; your feelings don't factor into that. Take as many precautions against wild animals as you can, including doing basics like keeping your cats inside and not letting your dog out unattended especially at night, but don't hate an animal just for trying its best to survive. They were here first and your home and fences are just another obstacle to finding food to them, no different from a river or bramble patch. If you want less wild animals attacking pets, then support efforts to revitalize local ecosystems so that they have an abundance of natural prey and don't feel the need to enter towns.
