Does a more accurate weapon really kill fewer people in every case? Even if the US government doesn't misuse it, the technology can always be sold to or hacked

Does a more accurate weapon really kill fewer people in every case? Even if the US government doesn't misuse it, the technology can always be sold to or hacked by some third party. It's also possible that when a weapon is deemed technically capable, people will be more comfortable with broad use of weapons and with expanding lists of individuals targeted for extrajudicial killing.