It seems like this is a place where “controversial” and “taboo” diverge in meaning. The politician would notice that the sentence was about a taboo topic and bounce off, but that’s probably totally unconnected to whether or not it would be controversial among people who know anything about genetics or intelligence and are actually expressing a belief. For example, they would bounce off regardless of whether the number in the sentence was 1%, 50%, or 90%.
It seems like this is a place where “controversial” and “taboo” diverge in meaning. The politician would notice that the sentence was about a taboo topic and bounce off, but that’s probably totally unconnected to whether or not it would be controversial among people who know anything about genetics or intelligence and are actually expressing a belief. For example, they would bounce off regardless of whether the number in the sentence was 1%, 50%, or 90%.