Supposedly there was some very advanced top secret military technology brought in at one of the airports, but they are not saying how successful it was and no confirmed arrests resulted, which you would think would be the case if an actual drone was knocked down and tracked back to a perp.
Knocking down drones out in open space with the numerous types of advertised military hardware is different than doing it in densely populated urban areas where a lot of collateral damage can occur, it seems.
Hit a drone with another drone? That’s not likely to damage other kinds of infrastructure badly, if at all.
Drones should not be hard to jam, but that invites the same problem: disruption to legitimate users. Putting up with police questioning is probably better than losing a drone to a security services induced crash.