https://www.thetrace.org/2015/12/sandy-hook-mass-shooting-hoaxers/
http://www.theblaze.com/news/2013/01/23/this-is-theblazes-point-by-point-sandy-hook-conspiracy-theory-debunk/
Two things that stand out that these conspiracies don't even try to explain, nor do they want to.
"The evidence on which these budding theories are based is, even by the standards of fringe conspiracy theory, remarkably thin, and demand massive collusion between hundreds of private citizens, the federal government, local authorities, and the news media.”
These are lives of real people, they were friends and coworkers, and families. They lived this terrible tragedy... one father said “I was there. I’ve been to the funerals,” “I know the families very closely. I know a lot of those children. It happened. It really happened.”