First of all, if some refugees are terrorists/killers, you can name one case. Go ahead.
Second, the tweet said 3 in 100. 1 in 10,000 or 1 in 1,000,000 are vastly different probabilities. (To clarify: it seems conceivable that one in 1,000,000 is a terrorist, but I’ve seen no evidence of that, and I would be very surprised if even close to one in 10,000 refugees end up killing someone from the host country after leaving Syria. 3 in 100 is laughable, or at least, it would be laughable if there were anything funny about it.)
Those deaths are the cost of closed borders. The only way to stop this madness is to open our hearts and push the rest of the world to do the same. There are simply too many refugees for adjacent countries alone to handle, though some of them are making a heroic effort.
The U.S. should strive to be a world leader in moral questions, and it’s failing big time on this.