Afaik this happened with every single instance of a communist country. Communism seems like a pretty good idea on the surface, but then why does it always become autocratic?
I do think its bizar, but the writer ( or in this case probably translator, i need to lookup the original japanese lines) knew full well what seth is about and what his goals are and nailed it so well. Props to that damn writer and/or translator. Also the voice actor, who delivered the lines perfectly. The raising of his voice, it slowly getting more and more agressive. Perfect.