Do you think aliens in ufos have visited Earth? (And all things UFO)

saintmdterps said
Some science fiction writers have postulated that time travel is actually very simple, but aliens have been on earth preventing humans from discovering it so that we cannot infect the rest of the universe. Aliens don't want us spreading our **** throughout the galaxy. Given how humanity has conducted itself here on this planet, I have not trouble whatsoever believing this theory.
Click to expand...
I would go one further and say that we have technology that will allow us to travel to nearby stars, but are prevented from using it for those same reasons. Just like you wouldn't want all the chimps in the world to know how to drive and use atm cards.