Science Fiction

I don't know, they probably don't want to come back here because it's disgusting and depressing. Steven Hawking once held the worst party ever and announced that because no time traveller's turned up they can't exist, like they can go anywhere why would they go to a dingy room with an egotistical and unpleasant discredited physicist? Sure his personality traits weren't widely known and his theories were popular but someone from the future is going to see things differently.

Try talking to old people about things like race and gender, now imagine having to fit into a world where those old people opinions you find hard to take are the progressive ideas because the olds are young... then go back another few steps, you're talking to one of the most progressive and respected people of his time but his teenage slave girl is pregnant with his child that he'll keep as a slave until he dies (jefferson)

'Hey timetraveller we set up the best night ever to thank you for curing my plauge, were going to go drink the most vile and disgusting beer you've ever seen, eat actual dead animals and watch people torture a bear!'

Going beck in time is horrible, you'd have to be a degenerate pervert to want to come back here