FBI Director James Comey added in congressional testimony last month that “a number of people who were of serious concern” slipped through the screening of Iraq War refugees, including two arrested on terrorism-related charges. “There’s no doubt that was the product of a less than excellent vetting,” he said...
No human endeavor is 100% proof. The big issue is whether our country should allow refugees to come to our country. You don't throw out the baby with the bath water.
Don't forget, we are all product of refugees. Refugees are necessary for our demographics both economically and population-wise.
White supremacist thinking is outdated, bigoted, and wrong. All the immigrants from different parts of the world made our country what it is today.
We attract the best and brightest from around the world to Silicon Valley where we live. It's the industry that helps our local economy in many ways, makes California one of the richest if it were a country, and helps to maintain and improve the health and well-being of not only the US, but around the world.
California has some of the best universities in the world; Stanford, CIT, Cal Berkeley, USC, Cal Poly, UCLA, and many others. Many students from around the world attend these universities. Many stay here to create new businesses.