You're so right. This issue is not testable by debate. That is the argument. I can't make a peach, fly, lift ten times my weight, run 60 miles an hour, or swim up the Kenai River. The assertion on it's face cannot be proven simply because you, or ten billion other bipeds claiming special powers wish it so. Even if it is the case that humans possess certain abilities that other animals or life forms on this planet don't possess why would that condition, in itself, afford you the 'right' (except that you wish it and have the power to effect it) to place your will above those of other creatures. Humans created 'rights' because (most of the time), it's an easier softer way than war and mayhem. There are no rights without to the power to secure them. When the power changes so do the rights. Ask any native American how this works.