They continued to talk about it. Mistake, period. Just, no. If I ever do something illegal, I will never talk about it after the fact.
I have even had conversations with friends when I was younger:
"Hey, how did you manage to get away from <place that got busted>?"
"<incredulous look on my face> Why would you even ask me to admit I did something illegal that actually got busted by the police? And, even if I were there, why would you expect me to be stupid enough to answer?"