I agree with the risk in the way it was first presented. However, I took from it that he was in the wrong place at the wrong time, was arrested, and eventually cleared of everything. Through that experience he was afforded an incredible perspective of the power and the justice within the justice system...
I take an angle of hardly addressing the incident anymore than what I just said above... and then focus on the true life-changing focus and perspective one gains after going through that.. and where it has lead him today. He and I are working on a much different version of the same story presented earlier.
With that approach it has potential to be a great PS.
All of the risk issues are true, and if there is a more powerful PS about helping nuns get to the voting booth, that would certainly be safer. I think the OP is well aware of all of this now. I just tried to provide the help he asked for.