There's a space between giving a shit and being passionate. I don't imagine one should be apathetic, but it probably shouldn't be your 'save the world, come hell or high water' project.

People passionate about an idea can make great employees. Someone giving direction should be a bit more objective. If you can be both objective and impassioned, you're in a small minority. Lots of people seem to think they can, but wait until they fall head over heels in love and see how objective they really can be.