Why don't we care more about whether people in positions of power have empathy?
(rachelgilmore.substack.com)
You have a very valid point. In 1970, the American population was just over 180 million. Today it is almost double that. It would not be a stretch to posit that American empathy at the voting booth has decreased over progressive US Presidents since then, as the population increased.
It is also interesting to note that empathy in Canada (a much smaller population) at the voting booth has historically been and is still a lot stronger than it is in America.
But I would also suggest that democracy in general weakens the larger the voting population becomes, and it would be fair to say that democracy does not scale.