Are airports now safe from drone threats?

Doesn't it seem like common sense? That it's a bad idea to fly a drone near an airport? And that it's probably against the law too?
This doesn't seem to have stopped drone owners near London Heathrow, London Gatwick, Newark, Dublin and Dubai airports. Over the past months, these airports had flight operations grounded because of apparent drone incursions in the restricted airspace used by landing and departing aircraft.
Just before Christmas 2018 at London Gatwick, the travel plans of more than 140,000 passengers were disrupted and 1,000 flights were canceled over 36 hours, after reported sightings of drones stopped all movements at the airport.
Drones have been reported in and around restricted airport airspace around the world, sometimes spotted by pilots. Airborne firefighting operations have also been grounded because of unauthorized drones -- a grave safety issue for the pilots trying to save homes and forests, using helicopters and aircraft.
Although there have been but a handful of verified collisions between drones and aircraft, there continues to be concern that the impact between a drone and a large commercial aircraft could result in a tragic accident.
So, focusing on passenger safety, airport operators have been holding all departing and arriving flights when drones are spotted.