I don’t think it defeatist to keep 20.000 home. It’s called “choose your battles.”
You're absolutely right, anything you can do to divert the enemy troops from the main battle helps. Planning your strategy to take away an enemy incentive is every bit as as good as winning a skirmish that then shapes the larger battle. The Federal government created that district expressly to always elect a black representative and the ammunition used fighting a rigged battle is wasted. The original post is an excellent idea and it applies to all the districts that were deliberately created to make sure a republican or even a democrat who is not black win in them.
It's not racist to admit that you opponent is racist and it's a lie to say that black folks haven't been granted the right to be racist to the core while slinging slanders at others over imagined slights. It's sad but true, the black community handed all it gained from the Civil Rights movement over to a bunch of whores who put feathering their own nests above their own people.
Regards