Yeah this plot is absolute garbage now. People get a gun and will randomly kill someone sitting next to them on the train? This all makes no sense.
Sakamoto Days only reached this level of script now because it allowed the villain (Slur) to achieve his goal. For a traumatized being in a house created to create murderers, this is an insane level of desire.
And for those who complained that the script was bad, in fact the script portrays what it is like in a world with weapons and the power to kill freely available to anyone. Like the United States has always been, for example. Or places in internal wars, like some African and Asian countries.
Brazil itself has reached a level close to this in recent years, when a certain president who supports crazy people released weapons to groups. The murder rate increased, and the crime rate was "covered up". This president left power, but governors with similar thoughts (in São Paulo, Goiás and Minas) act in a similar way, so much so that it is the same situation: murders increased, but the number of crimes is disguised.
(Rio de Janeiro is not mentioned because it is a failed state, already in the hands of corrupt people of all forms. There needs to be an IJin from "Teenage Mercenary" + Sakamoto to end crime).