One thing to point out, leaving behind the true reasons why this happens, is that they can show what can be achieved when a group of individuals come together for a common cause. The world should definitely learn from this. Regardless of the motives of those who drive them to do their works, it shows that we as human beings are very much capable of coming together peacefully and without jealousy or competition. To see a KH or assembly hall come together shows that when people are moved by something that is grater than themselves and, given the perception, that is meant for the common good, then we can achieve great works.
I know, we all know the truth, but there is no argument that this side of humanity is rarely portrayed in a harmonius light. The best we've seen of humanity coming together in mainstream media always have some kind of violent twist to it. i.e. rebelions that tople oppresive governments. It is ironic that such rebelion might be due in this case as well.