We are so, so close to that. Political parties and nation states now effectively have memetic warfare arms in the form of very advanced and soon AI augmented PR and propaganda agencies. Where there is attack there must also be defense.
Arms races tend to push innovation, which is why I now wonder about actual adversarial attacks on the brain that can bypass choice and thought entirely and even cause illness. That would be the logical endpoint, sort of like how the hydrogen bomb was the outcome of the bombing arms race. If it’s possible I predict it will be discovered in the next 25 years. We may see a video that sends people to the hospital that appears, say, right before an election and is targeted at the opposing side.