I think it's possible for everything to be real about the bombing AND an actor or two who arrived with "veiled" (covered up with pants) fake bones protruding to be unveiled at the right moment so he could be the poster boy and ID people, AND some fake blood used by him or his accomplices AND photoshopping. The point of all that would be to introduce mass confusion and dissent amongst witnesses and analysts which is exactly what we see here.
First rule of intell: observe the situation, assume that it was planned that way. Then, figure out how.
I would say that the folks saying it was ALL actors and ALL staged are set up to do that by noticing that SOME of it has to be actors and staged. That serves a couple of agendas: 1) makes their whole schtick less credible if evidence is provided that some part of their claim is wrong; 2) generally makes them less credible to the masses who still can't believe that 9-11 was an inside job, though that group is shrinking.
On the other hand, saying there are no actors, nothing staged, in the face of many of the observations AND the logic of why it would be useful in this situation, is not very helpful either. Some of those photos of injuries raise the same kinds of questions that the twin towers raised on 9-11 - violation of laws of physics. Sure, we can stretch things and come up with reasons why the blood would stop, why it wasn't everywhere, why it was so red, why it seems to have stayed red beyond the time when ordinary blood would have started turning dark, but all of them together???
So, I'm saying, the whole situation - just as Sandy Hook - is strongly suggestive of at least a couple (or more) ACTORS who played their parts in stunning, visible ways, so as to be available for emotional hooking/poster boy type stuff just as there were compromised witnesses to 9-11 who were widely and visibly interviewed or quoted. In that situation, most of them turned out to have gov backgrounds and the 9-11 truthers were quick to find it out. So in this scenario, they probably found a way to get actors/witnesses who had been sheep-dipped more effectively.