Occam's Razor in Practical Explanations for ET behavior

Often most speculation about Extra Terrestrials comes from science fiction plots. Alien invasions. Alien implanting Alien DNA.

So, instead of that, other than the unusual premise that Space Aliens exist, let's try to explain reported doings for the least weird, most practical reason rather than the most weird.

For instance. Ex 1. Cattle mutilations.

Farmer finds cattle cut up, partially dissected and parts missing.
- ET eats meat.
- ET just like humans prefers certain parts of animals.
- ET doesn't hide the remains, because they don't really need to bother.
-ET attack cows behind fences, because just like another predator, most of hunting work is done for them. Is easy.
-ET works at night, because no one around.

ET abduction of humans.
-basically ET is operating just like any other medical scientist. Our doctors jam tubes up your ass, so does ET. Takes samples for data, not implanting alien babies. Conduct many tests and record results. Apparently the medical star trek tricorder doesn't become reality, or if it does exist perhaps it is too dangerous for living beings. May sedate humans in some manner so they don't become extremely agitated.

ET Craft -- Many descriptions have favored cigar shape. Is this the desired shape for future aircraft with a special type of propulsion, or just the best shape for carrying cargo? I notice from the most recent story, that objects dropping from 80,000 feet then going straight up again. This seems like the best way to get to Earth undetected. They went into the ocean. Seawater is necessary for fuel, making water, or multiple reasons? Are the ships passing through space here picking up supplies or residents somewhere near by?

So, that's the idea -- other than the wild idea the ET exists, go to the most practical and least weird explanations for things that are reported.