Actually, 10 poison ones would be more pretty much American society as it currently is. In fact, if you based the number of mass killings in the US by any group of people, it looks like the worst offenders are White, American males, especially when it comes to cannibalism in this country.
Look around you. How close was the last mass killing to where you live? I'd say the closest to me was the Sikh Temple in Wisconsin. And that was done by that nice Christian fellow that was too stupid to know the difference between a Sikh and a Muslim.
No, I worry more about the people born and raised here than I am about refugees that have spent two or more years being vetted before entering this country.
Fear mongering is the propaganda tools of dictators.
But now, I can never eat Skittles again without thinking the main ingredient is Soylent Green.