Which do you think is more of an issue; thinking too much or thinking too little?

I deal with the general public on a daily basis and I'd have to say without a doubt it's thinking too little (hell, the majority I see don't think at all). It never ceases to astound me the number of people who wander about absolutely clueless and oblivious to what's going on around them. In fact we were actually told by management that it was part of our job to protect the customers from themselves...what does that say?