I do not agree with this statement. While some people build walls others build bridges, and some people build both. There are ways to get around walls and bridges. Sometimes it's the bridge you build that makes people not want to cross it or the wall that you build that makes people not want to cross it. Sometimes it has nothing to do with what you built at all. Maybe someone else just doesn't want to cross your bridge or climb your wall. Those are the people who look for shorter bridges and walls, so don't waste time on them
