I don't think that the average bad guy spends much time scanning message boards trying to develop his tactics. I wouldn't worry about it.
I go with my overall plan of serious reduction in likelyhood that I'll be a victim of the random bad guy. If he's a serious tactics/gun person it's fairly unlikely that I'm going to do much to stop him anyway, so I don't worry about that guy.
I think in general the bad guys aren't usually even gun guys (other than owning a gun). Bad guys practice? Fairly unlikely.