Uly:
That's an interesting take on Hegel to say the least!
I've always been suspicious of any reduction of history (or of a historical movement) to just one cause or actor. To call Hegelian dialectics a murderer, let alone the biggest one of the 19th c., thus appears as quite the exaggeration.
You're right to point out that Hegel's work was rapidly missappropriated. The debate between left and right wing Hegelianism certainly suggests that much. But the sheer complexity (and obscurity, in some cases) of his writings made sure that it would be a long time before we actually got something clear out of it. As far as I can tell, Hegelian studies today are far more interesting than what Hegel brought about in the 19th. Questions of normativity, for example, can be raised from his texts that are fantastically relevant and useful to philosophical thoughts on the issue today. Understanding Adorno, also, or even some recent Anglo-Saxon philosophers such as Pippin or Danto benefits from due attention to Hegel's offerings. All that to say: don't be so quick to make Hegel what he's not. I won't teach the whole course here, but you might want to read some of Pippin's more recent articles on the subject: they tend to be very clear and quite apt.
But if I'm to make a Hegelian point that actually has to do with what I was saying earlier: interpreting history and the influences at work in its dynamics is an effort of interpretation. Interpretation is, for a large part, an effort to understand particular events in general dynamics, and also an effort to map out these general dynamics by looking to the particular events that make them what they are. This "hermeneutic circle" is very much in line with Hegel's dialectics. And one of Hegel's most important warnings, where interpretation is concerned, is that there is no "absolute beginning": we always have to assume something to get interpretation to lift off the ground. Choosing your starting point, Hegel thinks, you've already chosen the end point. (So the idea is to question the starting point and focus on its (contradictory) assumptions)