No I saw that as well and Lawrence O'Donnell specifically mentioned that question and pointed out the response was not answering the question. That their gun rights shall not be infringed does not explain why they feel they NEED assault weapons for two reasons. First, that there is a right does not mean they need them. Second, the 2nd amendment and other rights are not absolute
All 9 justices know that. And they know a ban on assault weapons is an example of that non-absolutism.