Whenever you have a highly-motivated and organized group, however small, things are going to change. The silent majority becomes the sleeping majority, providing the opportunity for some motivated minority of people to seize the day. That is how US politics has worked from the beginning. Just ask Thomas Paine or Ben Franklin.
OK, without Googling it, who said this:
"If a vocal minority, however fervent its cause, prevails over reason and the will of the majority, this Nation has no future as a free society."