The subject.
For me it started out with your "27,000 lost to this plague". Your stat failed to note that over half of gun related deaths are suicides. The problem we're dealing with at the moment is mass murder.
You put partial blame on rednecks spanking themselves over "gun porn". Tom wanted to respond with the stats about race to give another angle on the picture you're painting but he was smart enough not to be labeled a racist.
Remember, the subject is mass murder and assault weapons. You've illustrated what will be the roadblock to actual solutions- The habitual problem of liberals broadening the scope of the problem to demonize firearms. That may give your side a warm fuzzy but the 80,000,000 gun owners will feel differently.