We should accept the proposal to demolish the old train station, because the local historical society, which vehemently opposes this, is dominated by people who have no commitment to long-term economic well-being.
Evidence
The local historical society, which vehemently opposes this [demolish the old train station], is dominated by people who have no commitment to long-term economic well-being.
Preserving old buildings creates an impediment to new development, which is critical to economic health.
Conclusion
We should accept the proposal to demolish the old train station.
Evaluate
This is an ad hominem attack. Attacking the proponent of a claim does not establish that the claim is false.