Are we alone...? I think not...but are aliens visiting the planet and doing experiments on our people and animals - again - I think not. Why travel light years to disembowel a cow? If beings came within our solar system and saw how screwed up we were...would they really risk coming down, getting killed, experimented on, having their ship taken by governments, inciting war and .... see how much of a wasted effort it would be? I'd pass us right on by too.