For one thing, female voters wouldn't support a bloody domestic war that would destroy their extended families and the economy, and create masses of dying refugees of women and children.
Already politicians have to do baby talk and avoid foreign affairs and military issues to win the female vote, and someone thinks that suddenly the democrat party will be running candidates calling for a domestic Armageddon, because the tax collections will change?
The left may hate our guts, but they don't have the will to see their fellow Americans bombed into submission over a purely political matter. They'll let us go our way before they'll allow a single bullet to fly.
Hell, they barely have the will to support a military response to nations that pose a real threat to us.