"Those who really live cannot help being a citizen and a partisan. Indifference and apathy are parasitism, perversion, not life. That is why I hate the indifferent."
It's sort of hinting at a false dichotomy here. You don't have to be partisan to be engaged. There are many nuanced positions and ideas. Perhaps the author lived in a different time or place that doesn't have two main parties acting the way they do today.