Well. It was on the ballot. It just wasn't likely to win because it wasn't an issue considered important by the two major parties. You could have voted PSL or Green or one of the other parties, as over three million people did in the last election.
Besides, by that logic, Israeli aggression wasn't on the ballot either! Do you think Harris would have stopped Israel from starting war with Iran? The war with Iran was already beginning in 2024 before Trump even got into office. Maybe it would have taken a different form, maybe it wouldn't have happened this year, but Israel was going to attack Iran and the US was going to follow.