In an interview, preparation is vital and part of that is knowing the company’s profile inside out. This would also give you an insight on the work environment, set your expectations about the company’s management and direction and verify if the company is really for you. What would be the downside if you failed to do this?
Just imagine being asked the question why do you want to work for this company and you can’t answer it, it would automatically mark you as someone who is just interested to get a job but not interested in getting a job for that specific company. What’s the difference? In an employer’s point of view, if you are just an applicant trying to get a job, they would not have any reassurance that you would stay and perform your duties as expected, unlike someone who is driven to succeed because they are really interested to be in that company.