WORCESTER – The last main walls of Our Lady of Mount Carmel Church crashed down under the jaws of large equipment in the midafternoon on Sept. 13 as former parishioners and other people watched. As had happened that morning, some asked a workman for bricks as a souvenir. Some reminisced, sharing memories of being part of the parish with their parents and grandparents. More than one, whatever their church affiliation now, called it a sad day.