If they found car tracks, my guess is that they misinterpreted them as simultaneous to the attack. Perhaps they were older tracks. Perhaps some newer tracks after the animals died and the owner or some relative took a look.

Try to read a few reports of somewhat similar case, like the one I linked. We agree that in neither case the explanation is the chupacabras. But it is interesting to see how a bad explanation can get a lot of media coverage and the evidence misinterpreted.

Also, try to get some sleep. If your explanation is correct, you would think a better and build a better system with enough sleep.

(And no bobby traps, you may kill a relative or a innocent bystander.)

No, you don't get it. We've seen the people trying to do it. We've chased them. They're real, they use ropes and knives. Those are not random accidents.