At the time you swapped, pops were so even that even a single small group of coordinated players would swing the balance and you knew that.
Not to mention literally half of DC leveled out at the same time and never came back after.
Its not that your group alone left DC hanging, its that when you left we were already down about 15-20 people from the cycle before, red was the last faction that needed any help, they already outnumbered 2-1.
When I came to DC i was joining the underdog. I had a choice of a DC toon or an AD toon, since i hadnt yet played blue I went blue. AD had the higher pop so there you go.
The leaderboards clearly showed the population skew as well. After the first day of a campaign cyle 25-30 blues would be listed, many with scores under 5k. There would be over 100 reds listed (no idea how many more there would be since it only goes to 100). AD was about halfway in between.
Now DC is completely dead, if you hadnt noticed. Not a single DC player even has 10k AP last I checked, while your group of reds fights a small force of yellows over Bleakers/Aleswell Farm every day.
Or how about all the faction flippers that left DC go back to it so the populations even out again. Seems the most logical, since EP has highest pop and DC is dead.
Seriously, the last couple of DC guys i saw on BB spent their entire day ballistaing down one wall of ash over and over and over, not even trying to take the keep, just sieging it trying to get a random or two to respond.
They dont even have the coordinated numbers to take more than a resource at this point.
The main reason im faulting you is that you played the coward card and joined the biggest population faction on the campaign. It would be akin to rolling AD on thornblade on haderus.