The Branch Davidians were a separatist, communal sect of the Seventh Day Adventists that had occupied several buildings and some acreage outside of Waco,Texas. David Koresh, the sect's leader, preached an apocalyptic message of a showdown with government forces.
The math is dead simple: it seems that the frequency of planets able to support life is roughly one percent. In other words, a billion or more such worlds exist in our galaxy alone. That's a lot of acreage, and it takes industrial-strength credulity to believe it's all bleakly barren.