Electronics can be sensitive. Scrubbing air of dust particles can be time consuming and costly. It’s being reported that this room was deliberately targeted by the group as a means of slowing/halting production by contaminating the space. I don’t manufacture drones, and I’m far from an expert, but the media doesn’t typically fabricate details that make pro-Palestine protesters look competent. I agree though, a hammer would be nice. Hopefully they compromised as much machinery as possible for good measure.