No, I'm not saying they are the same. I'm saying votes are a far more powerful weapon, and votes towards certain people lead to far more death than civilian gun ownership. Will you continue to try to deny this? Of course.
And indirectly, yes. The average voter IS partly responsible for the death their government deals out. If voters in the 1800s had been upset with the way the government handled indians, they'd have likely voted for candidates with a more pro-native agenda. However, they feared and disliked the natives(tbh with a fair bit of reason) and thus voted for more of the same brutality. That DOES make them partly responsible for what happened. The british citizens who voted in the parliament members that decided to tax the colonies without representation, then pushed the king towards declaring us in rebellion WERE partially responsible for the revolution happening. That whole scenario took more than a decade in full, yet the british people continued to vote in MPs that were going to be hard on the colonies. They share responsibility for the outcome. German people who voted for the Nazis because of dissatisfaction with the horrid economy and filled with dislike for Jews WERE(or ARE in some cases) partially responsible for the atrocities committed by them.
You see how this works? Democracy is about giving the power to direct national policy to the people, even if indirectly. Thus, they share some of the blame when national policy turns bloody. If you don't want to share responsibility with your government, go somewhere where you have no voice.