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Re intended behavior: clicking on bar graph is supposed to filter as you've described. It's also supposed to make that explicit by adding a filter item to the box that says what it's filtering for.
 
Re unknowns, I don't think there's anything planned, but I think we should be visualizing those separately. (And that the separate viz should show how "not researched" fits in when those answers aren't excluded by the filters).
[[Ethan McCutchen]].....2018-02-15 15:48:25 UTC

(The intended behavior will be covered in our tracking of this ticket. I'll track the unknowns thing separately.
[[Ethan McCutchen]].....2018-02-15 15:50:16 UTC