That might be a long bow. It seems this bastard would have attacked those people regardless of whether he had a gun. But the gun allowed more carnage.
Why was he released by that stupid magistrate? Don't you Yanks have recall elections for judges? I can think of at least 1 judge who is begging for a recall.
Long bows are less common and require more skill, I think. Compound bows are used for hunting some game and those are fairly powerful. There are bow hunting seasons for deer and perhaps bear in some places.
Jails and prisons are crowded in the US where we lock people up over a lot of minor stuff, including possession of small amounts of pot. I'm sure there will be political blow back over this but that doesn't help those who got killed much.