No, that's the reason to hate Kirk, not a reason to shoot him.
What in his upbringing led him to believe the way to handle the situation was with violence is unclear.
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Certainly not more creative compared to painting someone who openly supports school shootings as some sort of a martyr.
The school shooting that Mr. Kirk lost his life to is not, "left wing violence". Unless you want to submit that most school shootings are "right wing violence" if the shooter hated public education.