I agree in principle, but this might not always be realistic. bullets from a rifle can easily penetrate an unarmored vehicle or residential structure and kill people on the other side. frankly, I think the police should be expected to take a bit more personal risk to avoid killing civilians (even if they are in the wrong), but you have to consider that other people could be in danger. if it's a populated area, it might not be okay to just let the person keep shooting until the police figure out what's going on. of course, every shot the police fire also endangers bystanders, so they need to take that into consideration too.