Hello
I live on a five-acre property in Australia in the sought eastern corner of the state of Queensland and we have many birds on our property, magpies included. We have no fear of nesting magpies or plovers which both swop to protect their nests and young.
However, on our property none of the birds present a problem nor do they swoop down on us during their breeding season. I have never had problems with magpies or plovers, but I knew of people who rode their bikes where I rode my bike who had problems with birds.
Now when I am mowing on my 54" ride on mower, the magpies, butcher birds, peewees, plovers, kookaburras, ibises, wild ducks, just to name few birds, follow me and have a feast on the grubs etc in the lawn.
We are also hosts to large pythons which keep the possum population down for us.
If we ignore the bird population on our property, then the birds ignore us. However, if people come onto the property who are afraid of the birds, then the birds all sense their fear and will chase them, because it is these people who attack the birds, and the birds retaliate by swooping these people with much fanfare and noise.
I am sure that birds worldwide react in the same manner.