One of the many purposes of the justice system is to serve "justice" so people don't feel the need to take it in their own hands. The fact that so many people feel this murder is justified shows a clear breakdown of the justice system. Which should give everyone pause because that path does lead to the terrors you describe.
But the path to solving that has to involve adjustments to the system that address this mismatch, not just condemning the act or creating some huge diversion in the hope people will forget about it.
I would say that this is not only one of its proposes, but by far the most important. The system primarily prevents violence by convincing people they don’t need to commit violence to achieve justice.
If that starts to break down, people in power need to wake up and fix it. The system does not, cannot, protect them from the masses entirely by force. I fear that they have forgotten.
It is absolutely not the duty of citizens to bend to an unjust system, but rather that of the justice system to reflect the ethics of its citizenry. Clearly there is a severe disconnect and "civil society" reached a breaking point around this issue.
But the path to solving that has to involve adjustments to the system that address this mismatch, not just condemning the act or creating some huge diversion in the hope people will forget about it.