If only it was as black and white as you make it out to be: someone voted X on bill Y, they obviously feel X about Y. I shudder to think what it would be like if all the compromises I had to make every day were laid bare and presented in an absolute either-or form. Considering the complexity of bills and the amendments that are added and even the way they name them (PATRIOT is a prime example), I'm not so sure it's wise to interpret every single boolean vote as documenting someone's entire position on an issue.