Sure we remember the Oklahoma City bombing which killed 168 people. But since 1980 muslims have killed about 3200 civilians in  America (including 9/11) while non- muslims have killed about 200, including the 168 in Oklahoma.     Now in  order to assess risk, you have to take population into account - muslims are only 1% of the population and non muslims are 99%. Adjusting for this,   a muslim is more than 1000 times as likely to cause a terrorist death versus a non muslim.