SMarth said:The Sith were exterminated by the Jedi, now it's gonna be the other way around
That's something that kind of irked me with the prequels. We assume that the Sith were exterminated by the Jedi, and by all indications in the backstory (which Lucas isn't required to stay loyal to), they were.
However, something stupendous and critical to the motivation of the primary antagonists in the film as the Sith War doesn't even get a direct mention anywhere in the movies. At least the Clone Wars were mentioned in passing in the first Star Wars.
The closest the latest ones have gotten to exposition was Darth Maul's only line to the effect of "Soon we will have our revenge". Great way to add depth to the characters, Lucas. Now, we have an aspiring Chancellor Palpatine, but since we know he will be emperor, barring some really stupid plot twist, the only hope of adding any dramatic weight to him was to give him and the Sith some sort of a history. Instead we have some guy who pulls the strings of power for some reason the audience is left hoping is a decent motivation, since we'll never know it.
I'm guessing a rabid Jedi killed his family, a supposition as easily supported by the movie as any other.