I have "friends" (read: we mostly argue about this) who fit your description.
They will tell you that there are rules in place to prevent spying on Americans (and if you take a look at the Foreignness Factor screenshots, there is a sense in which this is true)
They will also tell you that the benefits outweigh the cost. Here we have a system that has allegedly caught 300 terrorists, and they would tell you that spying on foreign people to catch 300 terrorists is a good trade.
I disagree with them on both counts, but you asked what they would say.
They will tell you that there are rules in place to prevent spying on Americans (and if you take a look at the Foreignness Factor screenshots, there is a sense in which this is true)
They will also tell you that the benefits outweigh the cost. Here we have a system that has allegedly caught 300 terrorists, and they would tell you that spying on foreign people to catch 300 terrorists is a good trade.
I disagree with them on both counts, but you asked what they would say.