I was considering not creating an LSN account for the same reason the OP is deleting his, but I decided that I'll probably face the same criticism in life (I'm a URM), and LSN has helped me get a better understanding of where I stand in the admissions process, so I feel a little compelled to contribute to it. That being said, I'm going to wait until the summer after I get my second LSAT score before creating an account. Even with the inevitable flames, I think it's a valuable resource and certainly one I've benefited from (I will not be disabling comments either). Haters don't bother me, and in fact, I feel good when I get them so angry.
The site needs URMs in order to help future URMs know where they stand.
It's cool that you're deleting your account. I totally understand the negatives and that for you they outweigh the positives. Just promise that you'll never let the haters get to you next fall when you meet them face to face. Just brush them off.
You know I wonder if this issue arises with students going to Business/Grad/Med School. Is it only Law Students involved in this buffoonery?