This may not be the best thread for this comment, but since the issue has already been raised...
There is a reason for zoning ordinances, just as there are reasons for most laws, both criminal and civil. At what point does one's choice infringe upon another's?
I do have an issue with people breaking ordinances because the ordinance does not fit their wants. I do not have an issue with pursuing a change to an ordinance to achieve their wants, however, as it allows (or is supposed to) an equal and fair procedure for all interested parties to express and lobby for their opinions.
I like roosters, and their noise does not bother me. But, they are allowed where I am zoned, and my lot is large enough that they are relatively far from most neighbor's houses, although I expect that many can still hear them. Roosters DO crow during the night--mine usually start about 3am, although it is occasionally earlier. If my lot were small and neighbor's were very close, I can see them being concerned and upset about noise.
I have said here and other places many times, the source of the noise should not be the issue, but rather the volume, frequency (time, not wavelength) and duration, regardless of the source. Oh and also time-of-day.
There is a great deal that can be done to soundproof a coop. Likewise, other nuisances should be based upon the nuisance, not its source.
In this thread, as I understand it, the chickens are allowed under a state right to farm law, and possibly the lack of a town ordinance forbidding them, or that is in conflict with state law. The city council/selectmen are trying to do various end run-arounds to change the rules after-the-fact, which is constitutionally illegal.