In numerous old legends, prior to two armies engaging in battle, the two kings or a champion for each king would first fight in single combat. Based on the result of that combat between the two individuals, one side might retreat or otherwise sue for peace. An example of such a legend is the biblical story of David and Goliath, where David, who was essentially an unarmed child, slew Goliath, the largest, most powerful, and most skilled of the Philistine warriors. The Philistines were so freaked out by this turn of events that they beat a hasty retreat.
From one perspective, an election is similar to a single combat preceding such a battle. The basis is, of course, somewhat different. In this case, it's assumed that the larger army would win. The votes are counted, the "larger army" is identified, and the minority begrudgingly "surrenders" and allows the representative(s) from the "larger army" to rule them for a while. This approach is obviously less costly than having a total war every 4 years.
However, part of the reason that the minority allows themselves to be ruled by the majority, is that the majority implicitly and explicitly agrees that oppression of the minority is to be limited by tradition, institutions that have resulted from tradition, and the constitution. There's also the implicit assumption that the minority will be better off living under the rule of the majority as opposed to taking up arms and fighting.
If any of these implicit and explicit bounds on ruling are breached by the majority, the minority may be better off resorting to violence or any other approach that can make the lives and/or the lives of their families and communities better. Note that revenge is a significant component of making lives seem better.
With the passage of Obamacare, there are a significant number of angry people. There are claims of violence and threats of violence by those who oppose Obamacare against those who supported and passed it. This is not surprising and fits the above narrative perfectly. It's an inherently subjective analysis for each member of the minority to determine whether or not the majority has exceeded its bounds, so some people will be ready to resort to violence and subversion before others. Assuming the claims of threats and violence are substantiated and significant (a handful of such incidents is meaningless), we may be seeing the beginning of the minority moving towards violent confrontation.
There are many who are calling on Republicans/Conservatives/Libertarians to condemn the threats and violence.
Not me. I can't imagine why I would. It's part of the deal of ruling.