Gun manufacturers

If course gun manufacturers should be held responsible, but ... 

 Vaccine manufacturers first! 

Then all if the implements used for murder and destruction in the mass riots for 6 months as well as materials used in dirty bombs. 

Knife manufacturers

Metal / iron manufacturers

Fertiliser manufacturers

Nail manufacturers

Cell phone manufacturers

Brick manufactures

Lighter manufacturers

Bottle manufacturers

Cloth manufacturers

Dynamite manufacturers

Hammer manufacturers

Gasoline manufacturers

Car manufacturers too because a lot of people are killed in car accidents.

All first. Then we'll talk. Because everyone who manufacturers anything is of course completely 100% responsible for what people do with all of these things once they purchase them.