Needless to say, the whole 'reason' for doing it is half bunk! Quakers do not 'damage' trees, do not 'fight' for food and it's very easy to make sure that a large nest will not fall on people - Sheesh! back home we have been living with thousands of them since the beginnings of time and none of these things have ever happened!
But they are planning on rendering their eggs infertile and not actually killing them so it's not bad.
https://phys.org/news/2019-10-madrid-wi ... keets.html