The story so far: In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move. - Douglas Adams

If the Universe came to an end every time there was some uncertainty about what had happened in it, it would never have got beyond the first picosecond. And many of course don't. It's like a human body, you see. A few cuts and bruises here and there don't hurt it. Not even major surgery if it's done properly. Paradoxes are just the scar tissue. Time and space heal themselves up around them and people simply remember a version of events which makes as much sense as they require it to make.

"Your God person puts an apple tree in the middle of a garden and says, do what you like, guys, oh, but don't eat the apple. Surprise surprise, they eat it and he leaps out from behind a bush shouting "Gotcha". It wouldn't have made any difference if they hadn't eaten it.'
'Why not?'
'Because if you're dealing with somebody who has the sort of mentality which likes leaving hats on the pavement with bricks under them you know perfectly well they won't give up. They'll get you in the end."

"Ghastly," continued Marvin, "it all is. Absolutely ghastly. Just don't even talk about it. Look at this door," he said, stepping through it. The irony circuits cut in to his voice modulator as he mimicked the style of the sales brochure. " 'All the doors in his spaceship have a cheerful and sunny disposition. It is their pleasure to open for you, and their satisfaction to close again with the knowledge of a job well done.' "
As the door closed behind them it became apparent that it did indeed have a satisfied sighlike quality to it. "Hummmmmmmyummmmmmmah!" it said.