I can hear how strongly you all feel about this and I honestly can relate. Last year I became buddies with someone in town who loves bluebirds and seems to have had successful nestings for years. One day he called me thinking he had TRES in a box near his bluebird box. I asked to see a picture as it was very late in the season. It was of course a HOSP nest and parents. I explained what HOSP do to bluebirds and how most bluebirders handle the situation. He was appalled. I begged him to addle the eggs or prick them. He refused to talk to me after that.
Years ago a nest on my school bluebird trail got attacked. It was, indeed, awful. Right now, I’m doing nothing as I have seen no sign of the HOSPs. I am someone who brings bugs outside rather than kill them. (Vespids because I’m allergic are the exception, and mosquitoes). I will have to either bite the bullet or take my houses down as none of you has said that a spooker or the fishing wire (which actually worked years ago) will make a difference.
I’m grateful for the advice. (Just hate what I’m hearing. Hope you understand. )