Earth logic
I have a tendency to agree with Jody on this one.
Why should anything behave like we expect it to?
(That includes your kids and your wife.)
Anything that is possibly "alien"......will be ALIEN to us.
When we decide to study the migration of bears or moose by flying loud helicopters over them, shoot them with tranquilizer guns, then land and tag them; do you really think the bears and moose can explain it?
Do they think that there can't possibly be such thing as a helicopter?
And right now we have no proof that either cattle mutilations OR crop circles have anything to do with "aliens". It just goes into that big bag of the Unknown.