Spoiler : Read the book first!
{The Vogons were really intended to be a reflection of people when they become sluggish, boring, crass, uncaring, etc. They know what is right and what is wrong, yet, they do what is wrong, not because they want to in all cases, but because they simply don't care for a minor inconvenience. I truly enjoy the way Mr. Adams brought this out, he was a remarkable author.}