True, 4th edition is more lethal than earlier editions (a good thing, I never liked how a single PC could kill 4 gangers before they could draw their weapons). But most most cops and guards of smaller Corporations shouldn't be cybered. They will probably have physical attributes slightly above average, wear light armor and carry a heavy pistol. And they will probably not have too many skill points in their pistols skill.

So all characters should be able to defend themselves, but you don't need a group consisting only of street samurais with a few noncombat skillpoints.