Gatwick International Airport ( south of London) - It was bound to happen one day. Unsurprisingly the authorities seem to have been caught completely with their pants down. No Jamming system in place, no-one willing to shoot them down for fear of stray bullet damage (ever heard of shotguns???). Chaos for thousands at the start of the holidays, see,
https://www.bbc.co.uk/news/uk-england-sussex-46623754
obviously your point of view is very limited and you are not very well informed but still making judgment. Anyway, to answer some of your issues:
1) They afraid of shooting drones down for fear of stray bullets - reason for that is they are not standing directly under the drone and cannot shoot to the sky, the drone is always flying away from them and also is flying relatively low so in theory shooting at it would mean shooting in straight line, which brings the risk, if they miss, bullet might hit someone/something straight behind it.
2) No Jamming system in place - it turns out it is not electronic drone but fuel-powered (like old school RC planes ) hence whoever is flying it - he can flight it for longer than 15 minutes. Jamming radio signals would probably jammed planes radios and Control Tower radios etc.
Good solution, in my opinion would be to involve 1 helicopter, and fly it relatively close to the drone. Strong push of air generated from helicopter would most likely pushed drone down the ground. This method has been used before around the world.
Other, slightly more risky method could be to hire drone pilot and crash-fly another drone to stop this chaos.