All questions are important to the person who is asking them and deserve our fair share of attention. For example, it may seem at first glance that a request for the words of a song is less important than the address of a business requested by the local factory. The request for the words to a song may, in fact, be critical to a patron who is planning a public performance for a charity benefit. We can't be the ones to judge the seriousness of a request. Only the patron who asks can do that.
Every patron has an equal right to the services of the library for any information request.
I also means that even if you do not agree with what the patron wants to do, even if you dislike the information asked for, you must put aside your personal opinions and handle the request in a neutral, impartial way. There will be times when you react strongly against what the patron asks. You have a duty as an information provider to do your best to provide the patron with the information wanted. Your personal opinions are yours off the job. At work, you must remain unbiased.