Why hasn’t there been a large scale killer-drone attack if the technology exists, is inexpensive and easily acquirable?

Question

Talking about small, consumer-level quadcopters flying into people and killing them with a small amount of explosives. This terrifies me.

In: 0

Answer 1

There have been:

https://www.cnbc.com/2018/01/11/swarm-of-armed-diy-drones-attacks-russian-military-base-in-syria.html

The Syrian Civil war has seen multiple events like this.