I agree with you that it sends a very poor message. But in the grand scheme of things, whomsoever He has predestined to eternal life will be led to the Lord. In the case of the ministry cancelling the service, there is nothing mandating their worship and remaining open. Then again, God may have elected them for some marvelous rewards in heaven, that might simply go unclaimed and serve as an eternal memorial to the foolishness of any man who fails to remain with Him in all things.
Besides, maybe there is some homeless guy who happens to show up at the church and unbeknownst to all, witnesses to an unbeliever who wanted to hear the Gospel, and then even greater blessings await them both in eternity.
God Bless.
Or maybe, just maybe, the normal attenders of the church service for once quit warming the pew and use this opportunity to go out, find a homeless guy that doesn't know the Gospel, invites him to their home for a Christmas meal or takes him out for one, does *life* with him, and shares the Gospel and he gets saved!