The reason why we never meet time travelers is because our civilization ends before the technology can come to fruition.
Sort of similar to the Great Filter theory, but applied to time travel technology.
Sort of similar to the Great Filter theory, but applied to time travel technology.
Basically everytime you go back it will make changes to the future in such way you don't exist thus the time machine by its very nature can never be discovered. Everyone that does immediately erases their future self from existence.
I've never been motivated to create a time machine, but you've suddenly made it extremely appealing...