Assuming it isn't outright illegal to shoot them there, if crows are as smart as some people seem to think they are, you probably won't have to shoot that many of them before the rest get the idea and find a safer place to roost.
Think of it as evolution in action.
Yoga class makes me feel like a total stud, mostly because I'm about as flexible as a 2x4.
"Design"? Possibly. "Intelligent"? Sure doesn't look like it from this angle.
We used to be hunter gatherers. Now we're shopper borrowers.
The three most important words in the English language: "Front Towards Enemy".
The world makes a lot more sense when you remember that Butthead was the smart one.
You can never be too rich, too thin, or have too much ammo.