Lots of people talking about revolution and fighting the government, but this is largely irrelevant at this moment.
What is a source of oppression to which this is immediately relevant? Personal defense from white supremacist stochastic terrorists and individuals wanting to commit violent hate crimes. In the near term flare ups of right-wing paramilitary and lynch mobs are possible as well, location and circumstances dependent.
If you live in America, I would wager that you're aware of armed would-be fascists in your neighborhood. I would wager you can check social media for your local area and find a presence of right-wing paramilitary. I would wager that depending on the color of your skin or gender presentation, a call to the police could mean a roll of the dice on becoming a statistic of state violence.
Yes, it would be preferable if all of those groups did not have weapons, however this is America. Until disarmament is universal, unilateral imposition of gun access limitations means access will be affordable only to those with wealth.
Others cryptically calling for Luigi: First, I would also ask you what changed about the behavior of United Healthcare and the US for-profit health abuses as a result of his actions? If you are going to encourage others to throw away their life in the same way, what are you doing behind the keyboard? With these critiques that others don't have any guts, aren't you just externalizing your hypocrisy?
Second, I would ask you to look at the many decades history of assassinations in Russia in the pre-revolutionary period in which this became a very common and very ineffective tool. In fact it was so ineffective, it resulted in the Tsarists infiltrating Left groups and encouraging assassinations due to the public alienation and sense of helplessness it fostered.
Compare these failed actions to the successes of the Russian Revolution.
As Trotsky wrote in 1911:
If we oppose terrorist acts, it is only because individual revenge does not satisfy us. The account we have to settle with the capitalist system is too great to be presented to some functionary called a minister. To learn to see all the crimes against humanity, all the indignities to which the human body and spirit are subjected, as the twisted outgrowths and expressions of the existing social system, in order to direct all our energies into a collective struggle against this system—that is the direction in which the burning desire for revenge can find its highest moral satisfaction.