It's kind of a comforting thought - if there are deadly robots being sent back from the year 2748, that means the human race survived global warming and was able to invent time travel!

Dwight Schrute: And how big do you want this robot?

Michael Scott: Lifesize.

Dwight Schrute: Mmm no. Better make it two-thirds. Easier to stop if it turns on us.

whats more comforting is that, if they are able to send back things into time then we would have enough computational capabilities to solve the time space anomalies and paradoxes of time travel.

Or maybe he ended-up here by accident.