I have no personal experiences to speak of. Unfortunately, this does not in any way mean that disturbing events are not transpiring.
You are an experienced gun owner, and as such I'm surprised you don't know what I'm talking about - or perhaps it has to do with a river in Egypt? Let's see, there's our good friend Randy Weaver and the whole Ruby Ridge fiasco, there's the Viper Militia, and the famous group known as the Davidians. You may think of them as a religious cult and not a militia, but the idea is the same - individual gun ownership is villified through the idea that the 2nd amendment is a "collective right". This argument is commonly used to demonize militias, while the very word militia itself has taken on a negative connotation.