> how can we tell the difference between 'drive' and 'trying to appear well-rounded'? How can we tell if a high schooler wanted to do those five-hundred hours of community service, or if they were coerced into doing so by a parent or school?

that's a good question - and this same question needs to be asked by a prospective employer during hiring interviews. In other words, you have to try and understand the applicant, and see if they really want it, or is only wanting it for extrinsic reasons (which i deem to be a bad reason for wanting to study).