The relevant bit in "Why do you want to work for our company" is the unstated "...as oppose to another." Ideally the answer is some property of the company that aligns well with the candidates ideals. But it presupposes that the candidate knows of some attribute that fits this frame.
A better question might be to make the company attribute hypothetical. Something like: "if you could propose a rule for all employees at the company where you want to work, what would it be." You'd definitely need follow-up questions and promoting, but it could be way more insightful.
The question "Why do you want to work for our company" can always be answered with "I want to work with great coworkers and I've heard you have really great people here" no matter what company it is.
I could nave a few in SV where this would undoubtably raise suspicion. Many of the hottest companies are well known for being successful dispite (because of?) their challanging working environments.
At first you would wonder why anyone would bother when the pay is often similar, but talented people seek a challenge. Many of the most tempermental composers always had a line of the best musicians waiting to suffer near-abuse just to have a crack at attempting something amazingly difficult that they respect.
A better question might be to make the company attribute hypothetical. Something like: "if you could propose a rule for all employees at the company where you want to work, what would it be." You'd definitely need follow-up questions and promoting, but it could be way more insightful.