How do you prevent pigeons from returning to lay eggs?

Well, that used to happen to me a lot, like 50 or so pigeons in my backyard, I used an easy solution, shooting as many of them as I could, pretty soon, they got the message and left, they never came back since

I had pigeons on my apartment balcony. I put fly paper (the strips...use rubber gloves!) on the railing, on the patio floor that was the gap between the floor and the railing and near the point where I saw their poop. They don't like stepping on the paper and decided to go elsewhere.