I’m familiar with Macross. The reason that’s not going to be a problem is that if you can build ships capable of tugging colonies out of orbit, you can build much more interesting and directly destructive things.
Lagrange points are simply thought to be places of greatest convenience. Most colonies built from Lunar materials will probably remain at Lunar distance from Earth, but with a little bit of built-in mobility, they will more likely form a ‘shell’ around the earth at that distance.
