I mean we don't count, to my knowledge at least, suicide bombers in the list of causulties,
No, they oftentimes do, though not always. If a bunch of people die in a suicide attack, the bomber is usually included as one of the dead. If one or two are killed, the bomber is usually left out.
Regarding the issue of the 2nd Amendment--the thing is, it's prefaced by the phrase a well-regulated militia, it's not just "EVERYONE GETS GUNS, YEE-HAW!!" Let's also remember that at the time, "arms" meant muskets that had a rate of fire of--at best--3 shots per minute. I sincerely doubt that the writers of that amendment would condone the notion of people being able to walk into a store and buy an AK-47.
Also, it really bugs me when conservative groups, seeking to look anywhere else to put the blame than on the readiness of guns, point at videogames and movies. Those things don't change a person to the degree where they one day wake up and decide they want to go shoot some of their peers. It probably is a bit desensitizing, but not to a dehumanizing degree. Even the most hardened FPS player or Horror fan can still be disgusted by high levels of gore and violence in some things, showing that aversion towards brutality can't just be winnowed out of a personality unless there's something more serious deep down inside that person.