A lot of arguments are repeated endlessly on the Internet, and elsewhere. I've often thought that someone should build a graph database for this. Then maybe we could move past the basic argument and go a little deeper.
I agree. There was Debatepedia (http://dbp.idebate.org), but it seems dead. Unless the arguments are in sort of machine readable format, any filtering will be difficult. The problem is the format - I believe AI researchers still struggle with that one.