If, collectively, the workers in America simultaneously declare they won't have anymore children in protest of capitalism and our rights being taken away, that poses a serious threat to their bottom line.
No more obedient workers or soldiers means no more profit or looting of other countries.
Collecting millions of signatures on a declaration of protest would be the a good way of showcasing the seriousness as well as those who were already planning to get a vasectomy to do it in solidarity.