The USA is so liked and adored internationally that it continually researches weapons of mass destruction. Should NASA land upon an asteroid, it will not take much to put an ion engine upon it and bring it nearer to the earth orbit. A chain of these will enable quicker use of the asteroids, a conveniently placed resource, a planet split into bite size chunks with ores, gems etc readily detectable and exploitable, once the tyranny of distance is conquered. Even language tends to warfare?
The closer the less useful bodies come to earth, the more useful they will be as a means of continent destruction. Until that time, they may be used as stepping stones to the planets, enabling trajectories to the solar system's resources.