I wasn’t sure where you were going to go with this. No one is saying that gerrymandering doesn’t exist, but even in most of the most heavily gerrymandered districts, Dems could win if only enough of them would get off their asses to vote. When HALF the country doesn’t show up, upping your numbers by even a small amount can swing elections where Republicans like to stack the cards on their side. This is especially true on mid term years where Dems are notorious for not showing up, so they lose representation in Congress.