"like"-minded

why do we like something we read/hear .. more often than not it is because we hear/see what we want to see .. especially in the case of non-fiction books -- invariably i like something because subconsciously/intuitively i already believe what the author is telling me to be true and the discussion serves as a coherent, well-elucidated confirmation of this intution .. i guess when people say like-minded they are implicitly conveying this?