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True.
And you could always go back in time to stop me from stopping you from stopping the guy.
That's why I think time travel will never allow history to be changed, and I think Rick and Morty may have done a bit about that.
Indeed. Even the late Stephen Hawking arranged his own experiment to prove/disprove the possibility.
Apparently it was disproven...
https://en.wikipedia.org/wiki/Hawking's_time_traveller_party
Alternatively, Hawking proved that he was unpopular and nobody wanted to go to his party.
Exactly. Maybe Steven Hawking is just really bad at throwing parties!
I think not entirely - the experiment did not seem to rule out the case where traveling backwards in time is possible, but only up to the point when the time machine was built.
I.e. in 3012 Dwayne George successfully creates the first functional time machine, and moments later is slain at the hand of a time traveller who went back to prevent the invention of the time machine.