You can look them up on google....... No matter what you say to some people, you will never get through. Just learn to nod and smile. Only try on those that are smart enough to have an intelligent conversation. After you google firearm death statistics, google motor vehicle statistics. Then blunt object, knife, ect.

Here's a few:
CDC: http://www.cdc.gov/nchs/fastats/injury.htm
http://www.gunpolicy.org/firearms/region/united-states