D/L is VOODOO AND SHOULD BE BANNED!
j/k In all seriousness, though, I think a fair point was brought up before. There is a clear statistical basis to it. Just because you or I may not understand what it is, or why it works doesn't mean it's not fair. It just means we don't understand it.
Unfortunately, when unpredictable things happen, predictive measures have to be taken and that's basically what D/L is doing - using a mathematical model to adjust the score so the game can be finished in a certain amount of remaining time. Just like any model it may not have happened as was predicted. Or it may have. We have no way of knowing, so either we cancel the game, use a reserve day, or we agree to use a mathematical model to set a target and that's what international teams seem to have done. Sometimes it will work against you and sometimes it will work for you.