I like both.
I'm sure you thought of Columbine but left it out for a reason. Columbine is perhaps the most memorable, but that's a high school. So, the legalities of your second sentence in that poster would get complex with Columbine. By the way, the shooter in that Colorado church was likely incapacitated by a single bullet, even though he was shot multiple times. Maybe that's another poster idea.
The second poster should be entirely in color, as it is. It's important to show the similarities. Making the left side B&W would tend to provide a distance in people's minds. That would not be good.