I'm all about unfettered pursuit of happiness.

However, how is driving erratically going to further anyone's pursuit of that aim?

And if you run afoul of the law, communicating by whatever means that you have a gun is a bad career move.

Engaging in a high-speed attempt at escape is a bad career move.

Behaving erratically when stopped is a bad career move.

If the actions of the deceased are as described in this article, sad to say, but his death is upon nobody's head but his own.

His actions had no chance of furthering his own pursuit of happiness.  His actions had no chance of furthering the advocacy of individual liberty.  It only serves to affirm (and perhaps legitimately so) the need for the brutish marshall instruments of the state.  

DC Treybil