Invite us to their planet then kill us?

want-to-see-prometheusNOW!
MemberOvomorphApril 28, 20124608 Views148 RepliesJust like some of the other members of this forum, I was a bit puzzled why an alien thousands and thousands of years back would leave a map showing us how to reach them if we ever figure out space travel, just to try and destroy us when we get there. That's the one thing about the story that has really lost me. It simply doesn't make sense.
One possibility I have considered is that maybe it was never our visitor who attacks the crew. Maybe whatever visited us went extinct or was wiped out by the space jockeys. Maybe there's something we haven't seen in the trailer.
Any alternate takes on this? Would love to hear your thoughts.