I'm no fun at all when it comes to Conspiracy theories. Without doing any research, I'll comment on some of the "evidence " from your post.
"My first question is where are the security cameras and footage from them??"
I don't know. How do you KNOW they are missing?
I assume the sign was put up at Sandy Hook after the crime/hoax/bad joke) It was a crime scene with lots of potential traffic. Is there supposed to be something sinister about keeping track of people that enter the crime scene? If the sign was in place before the event it could well have been part of the school's security procedures. Nothing sinister there.
So what? Does that tie into Sandy Hook being a hoax?
This is a classic case of a Conspiracy Theory blog throwing shit up in the air and letting Conspiracy Enthusiasts draw sinister conclusions. Media helicopters regularly circle areas just in case news breaks. This helicopter could have been in the right place at the right time.
"Apparently the authorities---.. " Apparently? What Authorities are they talking about? Lots of questions just thrown out there. What became of the rest of the student population? Are they saying the school was empty? Are they saying parents were told to keep their kids home on Hoax Day?
Why were only the young targeted? Could it be that the killer, if there was a killer, just shot up the first classrooms he came to and they happened to be full of the youngest kids?
I scrolled through the rest of the "evidence" and will not comment on all of it. There is one thing that is typical of the whole Hoax , Hoax. A part of the "evidence" is that a young boy that was supposedly killed in Dec 14, attended his own funeral.
Surely to God that should have raised questions in the minds of the most dedicated Conspiracy Enthusiasts. The boy's parents, siblings, grand parents, aunts, uncles, cousins and neighbors would need to be in on the Hoax for. that to have not been reported some place other than this blog?