You're Wrong Stephen Hawking

Proof against time travel? Here it is. People are dumb; they use any technology they have, no matter how dangerous. If people could actually travel into the past, they would, and we'd know about it, because they (we) are not smart enough to follow the "prime directive". So, yeah, time travel? We already know it won't work, do not be fooled by Mr. Hawking's pretty eyes.