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originally posted by: Zaphod58
The reason they responded like this is because all the tower knows is that there's a plane on the ramp that is no longer responding. So they alert the police, who call for reinforcements. They have to verify that there's nothing wrong on board, so they send armed officers on board top search the aircraft.
The crew, meanwhile, is busy trying to figure out why they suddenly can't talk to anyone, and if it's a more serious problem, or something they can fix fairly easily. Even if they weren't that busy, they can't just call up the tower and say, "hey, I'm the pilot on flight x, our radio is out". Even if they have the tower number handy, the tower doesn't know that it's coming from that aircraft, and even if it is, they don't know if there's someone standing behind them with a weapon making them say everything is fine.
The same response happens in the air if a plane stops talking, only in that case, they send fighters to check things out first, then meet them on the ground with police. This was a perfectly normal, SOP response to a non-communicating aircraft.