Simple as the headline. The feeling is that you should leave the past in the past and shouldn't bring anything from the previous year with you into the new year. Of course that could be opening a can of worms, as you could extend that concept out in other ways that maybe aren't productive.
Christmas decorations need not come down before New Year's Day. One reason is that Christmas and New Years are each related, end of the year holidays. As such, the Christmas season is not really over until after New Year's Day. So it is perfectly acceptable to leave Christmas decorations up through New Years.
The holiday season is a fun and festive time of year and no matter where you live winter can feel long and bitter. Seeing even a small wreath or garland can lighten the mood and make us feel warm and happy. As New years falls in December in the middle of winter there is no reason to not keep up these happy and welcoming sights.
Christmas season does not end on December 26th. Christmas trees and holiday lights should stay up past New Years because the Holiday season ends after New Years day. Seriously with all the hustle and bustle of the holidays, do we really need to worry about taking everything down in the five days after Christmas Day?
I keep my Christmas decorations up until after New Year's Day. I like seeing the decorations up, even though Christmas is over. New Year's Day is the time for putting all of the decorations away and starting fresh for the new year. Keeping the decorations up just a little big longer keeps me in the holiday spirit.
Christmas is a time of celebration. It's the central holiday of the season with Thanksgiving and New Years. And with only 7 days between the latter two, there is not reason that the celebration can't continue with festive decorations. In addition, many celebrate Orthodox Christmas which is not celebrated until January 7th, which would still be practical for the decorations to be up. I would rather see a postponement of the Christmas season not starting until after Thanksgiving rather than removing decorations before New Years.