Liberty is of the utmost importance however...
there are lines that should not be crossed. True liberty is the ability and freedom to make choices. Liberty is not freedom from consequence. While freedom of speech is important, whomever is responsible for these threats has made a choice to threaten the lives and well-being of others and that goes beyond simple rhetoric. They have made a choice to take action and that action has a consequence affixed. We all have the freedom to be frustrated with things in our lives and to feel passionately about different issues. In the heat of the moment we even have the freedom to make rash or stupid comments as I have done in the past about the occupy wallstreet movement (ie. we should ship them off to Africa so they can see what wealth disparity truly is, or they should be locked up because what they are promoting is thievery). This differs in that this goes beyond hot-headed speech this is taking action that threatens the lives of others. They had to sit down at a computer and write not just one but multiple emails and send them to the university. Not only that but they did it in such a way that shows they knew it was wrong. It was a premeditated act designed to if not harm others at the very least threaten them harm. In my mind no effort should be spared in tracking that person or persons down and holding them accountable for those actions. Again this is not rhetoric this is repeated action that threatens the lives and well-being of others and that should not be permitted in any society.