If it was, Al Sharpton and Jessie Jackson will say that he took his time rescue the family and that he only did it b/c he had remaining guilt after the verdict that freed him.
If it was not a black family, Jackson and Sharpton will call him a racist for saving the family and claim that he wouldn't have done the same if the family was black. And there will be protests.
I think they are "jumping the gun" on this one and should wait to see how the federal charges pan out before they buy him something he can no longer legally possess. With the majority of people in this country (including a lot of gun owners) feeling that this trial was a miscarriage of justice, it is quite likely that the feds are not going to let this go easily.