At a guess, because crows are smart, resourceful little chaos goblins, with basically no fear, especially in groups. Maybe they like the noise the breaking glass makes, or maybe they're just curious to see what will happen. It wouldn't surprise me to learn that they've made a game of it, to see which of them can hit nearest the centre, or from highest up. I'm actually surprised that a single falcon manages to scare them off, after seeing what they do to buzzards round here. Even if the buzzard is minding it's own business, multiple crows will attack it in flight, dive it bombing and harrying it until it has left the area.

They're farming the raid boss

They are big oil drones, birds are not real.

Even further, why scapegoat the crows at all?

The local avian population no doubt bombs enough bad paint to cause issues when it anneals to the panels in the focused sunlight. Secondly, that one falcon is quite likely taking whatever it can find on the wing each sortie. Even ground critters. So...

Again. Why? 🤌🏼

Crows are based.

Leverage.