Each year, every city in the world that can should have a multiday festival. More people meeting each other, digging new types of music, new foods, new ideas. You want to stop having so many wars? This could be a step in the right direction.
Any demanding high technology tends to develop influential and dedicated constituencies of those who link its commercial success with both the public welfare and their own. Such sincerely held beliefs, peer pressures, and the harsh demands that the work itself places on time and energy all tend to discourage such people from acquiring a similarly thorough knowledge of alternative policies and the need to discuss them.