Car drives into Christmas parade in Waukesha, 6 dead

Yes, there was opportunity to drive into more people if that was his intention. Various videos I saw he was driving down one side or other of the road, which was not the bits of the route with most people on if maximum destruction was the aim.

Intending to hit people out of the way with his car and zero care for the consequences, yes. And that likely meets the definition of the type murder that he's been charged with.

Kill as many people as possible, I don't think so.

But that is you putting your biases onto the motives of his actions. The view I've seen which you are potentially referring to shows people being hit after a change in direction across the road, but the road is just as full of other people in the parade on the other side which he came from, and the video is partially obscured by a tree(?) , and there are even more people in the crowd at the side of the road watching which he doesn't drive through.

Can't access the actual state definition of intentional homicide at the moment, possibly the site has crashed. But here is a bit of explanation of the relevant state laws and what they mean. The words used for laws don't always match with how we'd use words like intentional in everyday language.

"Wisconsin laws do not include a crime known as unintentional homicide. An unintentional homicide - perhaps referred to as an accidental homicide - can still be charged by the state (or the federal government) as a crime. The actual charges that the prosecuting attorney will seek will depend on the circumstances and events leading up to the death, as well as the state's case and the elements of the crime that the prosecuting attorney believes he or she will be able to prove at trial.

Without Intent

Intent is one of the elements that must be proven in most crimes; however, the legal definition of "intent" differs from the common perception of the word. An intent under the law merely means that the person intended to do that act which then resulted in the commission of a crime. For example, a drunk driver might not intend to cause a death or even an accident, but if he or she got behind the wheel of a car and drove it, then the intent to drive (which then resulted in a death) is the intent element of the crime of vehicular homicide."

http://www.attorneytraceywood.com/IntentionalvsUnIntentional.cshtml

Where is this posting about running white people over with a car?

Unless there is another posting all I saw was a badly spelt ranty post from Facebook where its impossible to guess what they actually meant. It was certainly not some manifesto written out declaring his intention.