LoL...
Out of all people you are quoting Trotsky? Really? How about quoting Lenin, I am sure he had a lot of smart things to say as well...
Instead of reading HN you should watch Fox News. No quotes of stupid ppl like Lenin and Trotsky there...
The same applies to Trotsky, if you read that wiki page you will see Trotsky's idea is actually pretty damn good.
He is obviously expressing surprise at who it was. Just because the person may have not been a role model or the brightest person in general, however, does not mean all of their ideas must be thrown out. If you disregarded the ideas of anyone who believed or did something you disagreed with, you´d only have yourself to look at.