As someone who's interested in conspiracies in general, you often hear (in the media) about conspiracies alleging Sandy Hook never took place, or something to that effect. Of course, they put their own filter on it, and as a result it's impossible to really organically form your own opinion on the matter, so I went and found out what the people who believe it was a hoax had to say for themselves. The official narrative says that Adam Lanza, and mentally unwell young man, took his parents' gun, shot his mom with it, and then went to Sandy Hook Elementary School and shot a bunch of kids and teachers. Proponents of the hoax allege that either nothing happened, or that it was just sort of a drill. Proponents of the hoax theory present several pieces of evidence for their claims, some more compelling than others. So going point by point I'll present my thoughts.
The hoax theorists case can be viewed at:
1. Crisis actors were used because the people at Sandy Hook appear visually similar to some people at other crises, and many of the parents were, by profession, actors and entertainers. My objection to this argument is the fact that in a country of 350,000,000 people, it's by no means impossible to have people who look similar to one another. Furthermore, some people get into acting to make a living. That's just life. This claim generally falls flat, and I think most people would agree with that. The exception is for Mr. Parker, who is on video literally laughing and chit chatting with people prior to giving a statement...about his son being killed. This certainly raises a red flag, however, it says nothing about the other people involved.
2. Dash-cam footage from a police car in the parking lot shows no kids being evacuated at the time of or soon after the shooting. I think the hole in this piece of evidence is that it makes an assumption about what route the kids took being led out of the school. The kids were taken to the firehouse, and indeed the shortest path would pass right in front of that dash cam. HOWEVER, the shortest path in this case, was visible from a lot of windows as it required exit from a wider part of the building. It was also obstructed by parked cars. The safest route, in fact, would have actually avoided the area viewed by the dash cam in question.
3. An article was published in which the principal was interviewed in person. The catch? The principal was dead. She could not possibly have been interviewed. Furthermore, apparently the date the webpage on which the article was created was a day before the shooting. I also don't think this is particularly compelling because of the fact that the press in the US is notorious for sloppy reporting stemming from a desire to be the first to report on something. Factor in the panic of the day, and the reported could have easily misidentified the principal. Regarding the webpage creation date, that, more likely, is tied to the press being in a rush. If they'd created a blank page the day before, and then filled it in on the day of the shooting, then a computer would indeed say that the page was created the day before a shooting.