It varies a little in different parts of the world, but in the U.S., a working archaeologist is ordinarily expected to have a Master's Degree in Anthropology at minimum, and a PhD (doctoral degree) is pretty much a standard for project direction and teaching. Anthropology is still considered to be an aggregate of four specialized areas - Physical Anthropology, Cultural Anthropology, Linguistics and Archaeology. The sub-field specialties are emphasized in the advanced years of study. A general, but useful definition of Anthropology is "the study of Man(kind), who he is, how he got to be that way, and why he behaves the way he does." So to make a long story short, the anthropologist-archaeologist tries to find out as much as possible about the People involved (where investigated) and uses all the clues that can be found. So that is why they sometimes get a little owly about activities that diminish the evidence to be found. Sadly, they are merely People too, and sometimes act like jerks - same as most of us.