The Tsarnaev brothers were from Kyrgyzstan , although citizens . And that last part is key , isn ' t it . They were American citizens . Vetting would ' ve done nothing unless you ' re suggesting aroundtheclock monitoring of AmericanMuslims , which would be unconstitutional . The 19 911 hijackers were predominantly Saudi . Why are you even bring them up ? The world , the vetting processes , security as a whole is defined as pre 911 and post 911 . Everything changed . Since then , we ' ve seen massive changes to Homeland Security , the NSA , FBI and CIA . They have more powers in the vetting process since then . You can ' t talk about things that happened before or leading up to 911 in the same light , same context as things that happened after , at least not in terms of security appartus . Richard Reid was from the UK . And ? That has more to do with failings in airport security than with immigration policies , asylum seekers or anything like that . Vetting wouldn ' t have stopped him , because he wasn ' t immigrating . He was just traveling . Are you suggesting we vet every single traveler to the US ? Because that ' s the only way we could know if none of them are terrorists in disguise ? The rest of your comment is standard Most Muslims are bad , but I suppose that a few are good fair . And when you say extremely vet them , what do you mean ? What more do you want ? They are already vetted by Homeland security , the NSA , FBI and CIA . And again , the success rate of our current vetting process is absurdly high . How many Muslims have visited the US , or immigrated to it , since 911 ? How many terrorist attacks have taken place ? We ' re talking less than 0 . 1 % here , of failure . That is the sign of a ridiculously effective system .