The phrase "for the sake of the community" means to do something that benefits or is in the best interest of a group, rather than just an individual. Full definition
People were urged to join a church for the sake of the community. (religion-online.org)
We are forced into solitude for the sake of community. (firstthings.com)
If the person thinks his answer may damage Islam's Image, or that he might get in trouble by answering truthfully... it is ok to deceive the unbeliever... for the sake of the community. (religion.blogs.cnn.com)