Question about John Locke's two treatises?

[Eva]

I'm really REALLY confused ! I have this summer assingment due on the first day of class and I was doing it when I came across this word that didn't belong. Either that or I don't get why they used it. The reading is about how John Locke wrote two treatises on governemtn. The first treatise attacks Sir Robert Filmers theory of divine right that God allows Kings to dictate the people. The second is John Locke's own theory that people of the goverment have a right to change their government and their rulers. So this is the part of the assingment I don't get. It says in the reading "In publishing the essays, Locke aimed to vindicate both King William and the English Whigs for their part in the glorious revolution." I looked up vindicate (the word I didn't know) and it means defend or prove innocent or something, but then why would Locke want to defend King william and the whigs for their part in the glorious revolution when he wants to prove them wrong in the treatises ?! HELP !