No it's reinen's way of focusing on LII's tendency to use binary logic to put all people in a good and bad category. Robespierre is indeed LII, or at the very least his entire historical persona was written to make him look like an LII (lulz). Also, everyone has the potential to commit acts that others would call "psychopathic", depending on circumstances they find themselves in. Calling him psychopathic does not differentiate him from everyone else involved in events such as revolutions, or even your average Joe in the modern day. He did what he had to do.

I'm tired of people referring to all killing as psychopathic and murderous. It really is necessary sometimes.