This is an unfounded rumor. Research had indicates that they are as safe, if not safer, than other stock - and even man himself. Some have attempted to use this for their own purposes. Colorado State University and Oregon State Universitiy have strong veterinary schools. Both have strongly denied this rumor.
Llamas are safe to have around other wildlife and stock.
They pose no unusual threat. Every llama is a packer. Yeah, and every Ford cars is a race car. Some Fords have done pretty good on drag strips, but most street cars get left in the dust by true sports cars. No, Martha, not every llama is a packer.