There's lots of areas of the country that would like their own state as well. Maybe we can make a new state out of pieces of upstate New York that will trend republican at the same time as making DC a state, but no one will go for that deal.
In addition it would be the only state with no rural population, the number one state for receipt of federal funds, would surpass california as the most impoverished, and would have irregular borders and numerous jurisdictional problems between the "state" and federal authorities
Just remember that democrats had the house of reps for forty years and DC statehood was never a priority until the 90s when republicans got the senate
My point - Then you should not find it illegitimate for a majority to find something about you a mark that allows elimination of the bearer.