Back in the 1920’s and 30’s a common science fiction theme was the time traveler who killed his grandfather. But if the protagonist killed his grandfather, he would not exist, therefore he could not have killed his grandfather. OMG – he killed an innocent man!
I see Hilary Clinton’s chick, Chelsea, has a similar story. Chelsea is bewailing the fact that her Grandmother the unplanned child of an unmarried couple, did not have access to Planned Parenthood.
Which, for some reason, reminds me of an actress who stepped off the Empire State building. She wanted to make a hit on Broadway.