1. The point is that the terrifying systemic problem of school shooters should be tackled at its root causes, not merely suppressing symptoms. It's beyond absurd that schools in the US have become institutions of normalized violence.
2. Going to another room and closing the door renders any drone "not very effective…" School shooters have nothing left to lose. These drones are an extremely expensive yet stupid way of defusing such people. From the article:

The drones can remain airborne for about eight minutes on a single battery charge
I know the US is plagued by obesity, but I'm pretty sure the average shooter can outrun a drone for more than 8 minutes inside a building. What a bad joke. This is simply about signing contract deals for weapons manufacturers because everything about this screams poor taste.
However, not everyone is convinced the drones are the right approach.

That includes Tony Montalto, whose 14-year-old daughter Gina Montalto was among the 17 people killed in the 2018 mass shooting at Marjory Stoneman Douglas high school in Parkland, Florida. He told WPTV: “These drones aren’t patrolling – they just pop up when needed. So that’s part of the problem. We need to focus on the prevention piece rather than the reaction piece.”