Here I am, sitting in Louisiana where my newly gerrymandered district (4) simultaneously covers a third of the state, surrounds an entire other district, and cuts a relatively blue city clean in half (Lake charles at the bottom).
All so the state can comply with the court order to add another black district while keeping the republican stranglehold.
The "founding fathers" argument is pretty much pro-republican at this point. Unless you're a property-owning male the founding fathers didn't want you involved in their "democracy" either.
The short answer is that it would give more populous states a Democrat advantage. Republicans are well aware that they will completely lose power on a federal level if gerrymandering was outlawed.
So blame your local republican for being undemocratic