Well, while I completely agree with Dave, I also agree that he could have found a far better topic. Since you say this was a senior class project, it seems to me that the teacher should have assigned something much more rigorous than a 4 paragraph essay. I'm just wondering if this was a smaller assignment and the kids were told to pick out something they feel passionate about that affects them in today's society or if he was supposed to choose something deeper and do a lot more work on it.
As far as checking school work -I feel like as long as my children are in school, then I am at least going to ask them daily and weekly what they are doing, what they're supposed to be doing and when papers and projects are due. I want to see their class syllabus at the beginning of every semester so I'll have some idea of what's coming up in that class. I don't intend to "ride" them or actually check homework unless they bring home bad grades or I get a progress report or call from a teacher that lets me know they're slipping. If my child wants me to look over something, I'll certainly do it. If this was a serious, large project, it's something I would have known was coming up from the beginning of the semester, but if it was a spur of the moment assignment or a small assignment -maybe not.
If my son had a major senior project to research regarding injustice in the world, I would ask if the teacher presented a list of possible topics. If not, I would ask what he was thinking of using, and if he brought up the drinking age or some kind of driver's license law or something of that nature, I would steer him to much deeper problems in our world.