Because in the United States at that time, the radio communication signal was very bad at this time, so Americans poured out their ideas and used a lot of people to come up with a plan to launch 500 million copper needles into outer space. But this idea is naive, and it is generally impossible to realize their original plan, so it is whimsical.
The reason why they want to implement these plans is not for the complete benefit of the country and the people, because it was the period of hegemony between the United States and the Soviet Union, and the United States wanted to fight for something together with the Soviet Union, not only military politics, but also economic aspects and even the autonomy of space. Finally, in order to compete for the initiative in space war, the United States launched this plan, which was particularly bold and took a long time.
When launching a copper needle, they need to consider many factors, such as whether the launch of this copper needle will have an impact on space. And whether this copper needle can solve this problem. Therefore, before the launch, the United States must make these considerations. If it can't do these considerations, then the plan will never be implemented.
Even though he has made some considerations, it is still not comprehensive. For example, there is still some time to destroy these copper needles within three years. For example, they suspect that these needles will definitely be launched into the atmosphere, and when they reach the atmosphere, they can burn completely. Therefore, it will not cause some damage to space, which was their consideration at that time. But they didn't take these things into account. In fact, they didn't follow the imagination. Some of them did not deviate from the atmosphere, so space junk was later formed in space.