Animals would kill you

A common argument against granting animals the right to life is that they wouldn't return the favour. Animals are capable of only minimal morality, nothing like what humans are capable of. 

Then arises the question: if there exist a group of humans such as the North Sentinel Island tribe would kill you if you approach them - is it moral to breed people from this tribe for burgers?

If the answer is yes - it's a crazy position.
if the answer is no - then this is not a good justification to breed animals for burgers.