This question is in no way retorical:
Since voting seems to make a difference as much as us sitting around bitchin about it, how do we stop this? Without being "home-grown terrorist", because most of us agree we have to stop "them" and violence and millitary type actions only hurt our cause.
Sorry to bust your bubble, but you're already a "terrorist". The left has for years been labeling you as such.
I don't consider your question rhetorical. Its takes years and years, or physical and violent repression, for a people to resort to taking up arms. History shows us, if you have to ask the question of "when is enough, enough?", there isn't "enough" yet.