There are just as many reasons not to go. You will be committing yourself to three years that will lead you from exhilaration to ultimate frustration and many places in between. Therefore, evaluate carefully your reasons for choosing law school. Law schools don't just train lawyers. They provide good training for a variety of careers.
Some students have no intention of doing anything law-related.
They simply enjoy the discipline of legal education. Whatever your reasons, they should be good ones. The time, energy, and money required for law school are not things to be wasted merely because you want to postpone getting a job or because your great uncle was a lawyer. You will find that motivation is a make it or break it factor in law school, and it begins by making careful decisions to which you are committed. Your reasons for legal education will perhaps be most strongly tested in the first year.