It was a political assassination. That is according to the police and the Gov of UT. It was not random. It was planned. It was because Kirk was effective with young people. And the rhetoric used by the left media/politicians. When they say daily: He is Hitler, his supporters are NAZIs, white supremists, bigots, a threat to democracy etc etc is should not be a surprise that one or more of their supporters decide to "save the democracy."
This man was one of the most peaceful, he went to colleges and just talked to the students, he let the people with a different opinion speak their side and then he would say his etc. And they killed him for it. Because he was effective....
* When we have world leaders who think might makes right and/or call for violence to "solve issues", there will always be people who rise up and follow their orders/lead. History shows this.
* When we (meaning the people of the world) teach our children (or other children) - by our actions/reactions (or our lack of action/reactions) - that we tolerate (or sanction) violence or revenge with no consequences, they will repeat it and teach the same to their children. The proverb - "Start children off on the way they should go, and even when they are old they will not turn from it." - holds true in the opposite as well.
* So long as there is no justice evil actions will continue. We let murders get off unpunished or give them a "slap on the wrist". Many who do evil are let off (bribery, lying, etc.) simply because they are wealthy or hold positions of power.