Cap has also broke a chitauri's neck with one punch while it was pinning him, punted around the hydra goons like footballs, and tossed them over tanks. If he wanted to, those would've been a lot more injured. Heck, he even kicks this guy on the boat so hard that he flies and dents the metal wall behind him. He comes back to fight Cap again but that normal action movie bullshit. If Cap really wanted to, those guys would've been really hurt. Heck, remember him kicking winter solder into that car in the highway, wrecking it? do you think any of those guys would be alive if Cap kicked them that hard?