Blake, when I saw your comment I wasn't sure who you were thanking, since it was under Cindy's answer. But the edited version looks like you could be talking to me, so at the risk of speaking out of order, I'll go ahead and respond.
I'm sure you know that if there is such a thing as a "clear" copyright violation, there are legal remedies available to the copyright holder. The problem is that you can't get clear, definitive, objective guidance from editors, lawyers, or anyone else as to what constitutes a "clear" violation. If there has ever been a test case on a WikiTree profile, I'm not aware of it. Presumably we all know and understand that copyrights are to be respected here. If we had a single enforcer, or a small team, with some training, who could make the call objectively and consistently, I could live with that. But I would have a lot of reservations about individual members taking it upon themselves to decide, somewhat arbitrarily, where the line is between fair use and copyright violation, and then edit away. I'm assuming that Chris and Co. don't believe the site to be in any legal jeopardy over this issue, or we would have some structure in place. So if there's jeopardy, it must fall to the individual PMs, but again, I don't know of a case study. I think it's OK for you to warn another member that you think he/she may be in violation, but I doubt if you'll get a warm, friendly reception. And, as Cindy suggests, it's probably OK to add quotes and a source citation for a flagrant case, but she probably won't be getting any valentines from that PM either. It's a hard problem, but we just can't handle it effectively with separate individual initiatives.