Typography is an art. But there are those who’d like to ‘scientificize’; those who believe that a large enough sample of data will somehow elicit good typography. However, this sausage-machine mentality will only ever produce sausages. That typography and choosing type is not a science trammeled by axioms and rules is a cause to rejoice.
Don’t go in to the nitty-gritty of choosing type, let’s briefly talk about responsibility.
Fundamentally, the responsibility we bear is two-fold: first we owe it to the reader not to hinder their reading pleasure, but to aid it; second, we owe a responsibility to the typeface or typefaces we employ. Good typefaces are designed for a good purpose, but not even the very best types are suited to every situation. Personally, I’m always a little nervous about using a newly acquired typeface. A new typeface is something like a newborn baby (though it doesn’t throw-up on you): don’t drop it, squeeze it too hard, hold it upside-down;in other words, don’t abuse it, treat it respectfully, carefully.
A very good website about typography: