if these people constitute a faction in a civil war, inter-faction veneration of martyrs is sufficient, and that is clearly the case. The only reason why i'm not viewing mass shootings in the US as a form of civil war (yet) is scale - there is a subset of mass shooters that constitutes a distinct faction, and that faction is fascists. It's just that the number of people murdered by these fascists is (for now) below the number of casualties that are usually considered the cutoff where something goes from "very widespread terrorism campaign" to "small-scale civil war". Such cutoffs are arbitrary, they usually do not take population size into consideration, PoliSci is quackery to begin with etc., so take all of this with a grain of salt, but the usual definition of war i'm familiar with is "armed conflict with at least one organized faction that causes upwards of 1000 deaths per year". Gun violence in the US itself does not fall under that definition, as most deaths are either suicides or accidents, but it's noteworthy that when you strictly apply that definition, cops in the USA are already waging an actual war against their own populace.
if these people constitute a faction in a civil war, inter-faction veneration of martyrs is sufficient, and that is clearly the case. The only reason why i'm not viewing mass shootings in the US as a form of civil war (yet) is scale - there is a subset of mass shooters that constitutes a distinct faction, and that faction is fascists. It's just that the number of people murdered by these fascists is (for now) below the number of casualties that are usually considered the cutoff where something goes from "very widespread terrorism campaign" to "small-scale civil war". Such cutoffs are arbitrary, they usually do not take population size into consideration, PoliSci is quackery to begin with etc., so take all of this with a grain of salt, but the usual definition of war i'm familiar with is "armed conflict with at least one organized faction that causes upwards of 1000 deaths per year". Gun violence in the US itself does not fall under that definition, as most deaths are either suicides or accidents, but it's noteworthy that when you strictly apply that definition, cops in the USA are already waging an actual war against their own populace.