"Nevertheless, ye shall not cast him out of your synagogues, or your places of worship, for unto such shall ye continue to minister; for ye know not but what they will return and repent, and come unto me with full purpose of heart, and I shall heal them; and ye shall be the means of bringing salvation unto them."
3 Nephi 18:32
This scripture is talking about people that are unworthy to take the sacrament, but I think it applies to almost anyone. We should never ostracize anyone who wants to join with us in worshipping God. No matter who they are or what they have done in the past. We don't have the luxury of picking and choosing who we love and who we want to be in our Father's kingdom... ALL people are our brothers and our sisters, and belong there. So, whatever our personal prejudices, or our personal experience... we need to accept, love, and do everything we can to uplift the people around us. Offer a wider perspective, or an understanding heart... After all, we need second chances in our lives too... and probably ninety-third chances, and millionth chances. Don't withhold a chance from someone else.