The Irony of Partition

When we were fighting the Kosovo war we were actually on the side of partitioning. The bigger issue is there have been a lot of partitions in the world both in older times and more recent times that proved beneficial to the populations involved. It turned out that Czechoslovakia was an artificial state created by Wilson at Versailles. They eventually parted ways or two states there now. So what's wrong with partition if there is good and substantial reason and historic basis for it? There clearly is here.