Wrong. That's your projection and your value judgement. Guns are designed to shoot bullets. That's all that can be stated honestly. They can be used for "benign" activities, "good" things, and "bad" things... where the value varied depending on who is asked the question.
Even if they were designed only for "harm", you seem to believe "all harm bad". So should criminals in the midst of committing violent acts not be stopped because that would "harm" them? You won't answer this. Extreme pacifism is insane, morally-inconsistent, ideological, thoughtless drivel that fails to acknowledge the monopolies on violence delegated to police and military that they benefit from.
Perhaps you might want to have your military abolished because they are "designed to cause harm"? Or the whole abolish prisons and police nonsense? Real anarchy is really bad.