For my credentials, I attended (and completed) both graduate school and law school. I'm now a corporate lawyer helping big companies get richer. Feelsogoodman.
Hate to break it to you, but if you want to "help people", don't go to law school. Legal education and the legal profession generally have little, if anything, to do with "helping people". Also, as an aside, if "disparities" and "social injustices" really get you riled up, you might feel more so once you're looking at a six figure debt load and dismal job prospects after obtaining your legal education.
And yes, if you think you're going to be spending a ton of time in court and arguing the philosophical minutae of caselaw, you're completely off-base about what it's like to be a lawyer. I can only think of one exception to this statement, and that's criminal law. Good luck subsisting largely on legal aid certificates for the first 5-10 years of your career though.
ETA: Ignore all of the above if you come from a wealthy family and simply want to "explore" your "interests" with a law degree. Money isn't an issue for you, and you can afford to spend the rest of your life as a staff lawyer at a legal aid clinic. Congratulations and enjoy that $30K a year salary.