Should bride and groom return wedding gifts if it doesn't work out?

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Here's the scenario: 
Two of my friends recently got married. They divorced three weeks later. It turns out that they were both having affairs before the wedding and knew about it. They decided to have the wedding because it was already paid for and everyone already took that day off to come. I also see embarrassment as being a factor as well. So the question is, do you or do you not think that they should return the money and wedding gifts they got from friends and family? Why or why not? 

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