We're not speaking of "people" here, we're speaking of people who uphold certain values. They aren't some amorphous mass of people, they have preconceived notions of what entails a lawful and ordered society. Part of dealing with that in realistic terms is accepting that Islam is the sole religion of the Acehnese people. If someone is going to deal with loudspeakers, it needs to take into account the religious feelings of the Acehnese.
Besides, back home, people didn't seem to have much luck with common sense and decency. We have plenty enough people getting shot in the face for asking someone to turn down the volume. Doesn't seem like it's working out too well.