In defense of carpenter bees,
The swarming and stinging and disturbing a nest does sounds like misidentification. None of those behaviors are characteristic of carpenter bees. I do know someone who swears they were stung several times by carpenter bees but I’ve ‘literally’ (up to squashing them in my hand) done everything possible to get a carpenter bee to sting me and never been successful.
They are very easy to tell apart between male and female, and the males can be gently caught in your hand and held and they won’t and can’t sting.
I am very much on the page on build them something out of garbage 2x4s and let them go to town. I absolutely love them and love watching them pollinate my blueberries in early spring when nothing else is out and about. They surely must do 90% of the pollinating of my blueberries.
It’s also very easy to prevent them boring into wood. A light dusting with a propane flame thrower on whatever wood you’d like to protect will do the trick. They don’t like the taste of the burn and will leave it alone.
However, when carpenter bees leave a structure alone, they don’t protect it from other nesting stinging wasps and hornets. So in my mind you get to pick between carpenter bees and hornets that’ll sting you when you open the door to the outdoor facility that you didn’t shou shugi ban. 😂
I’d rather have carpenter bees. Word on the street is they reuse the same holes and mostly only eat the soft wood anyway. (is that true?? I can’t remember)
Anyway, I like em and I advocate for not swatting them. We’ve all got better things to do. Like eat the blueberries! And make more gorgeous shou shugi ban!