The member of the trust board would owe his/her fiduciary responsibility to the community of Hershey.
Milton S. Hershey was the creator of the company, hence the very reason you would be in this position right now. As such, the legacy of Mr. Hershey would affect your thinking such that you act in the best interests of the company to allow it to grow further and larger, as this is what its founder would have wanted.