“deeply offensive”... Interesting choice of words, personally that indicates to me that there is something to hide and the defences are going up. Else there is simply no need to do anything other than explain the facts and open up the data to the public. 
As others state here the traffic is getting worse that simply cannot be disputed, anyone who owns a car and has to get to work lives that dream every week. 
I believe that something has to done to protect the residents of Sammamish rather than the developers, preferably before this is no longer a place people want to live because the magic was sucked out of this city and replaced with traffic misery and a distinct lack of green space.