My limited experience in local government has taught me to beware of the few people who claim to represent majority opinion. Usually it is their own opinion and they have persuaded a few others to support them - that is why a so called action group meeting attracts only a very limited percentage of the local electors.
The only way to fight such people is to mount a similar but more successful campaign in support of Tain Range. Not an easy thing to do as people are more likely to support complaints than to support the status quo. However, one could make a start by persuading the employees at Tain and the businesses that benefit from their income and an active range to gather support verbally. One could also distribute a survey to find out how many people would really like the range to close, but not before those interested in keeping it open have launched their campaign.
Democracy is not best served by allowing those who shout loudest to triumph.