Trouble with all this guilt by association is we don't choose friends and neighbours via criminal and national security background checks. Friends come from mut

Trouble with all this guilt by association is we don't choose friends and neighbours via criminal and national security background checks. Friends come from mutual situations such as work, or events, and chance via already existing friends and you just get along (or are attracted). If you live nearby you might even be visiting a possible terrorist for barbeque or beer entirely innocently. I suspect few will be discussing, or have any idea of, their plans for a bank raid. We may have a lot of data and meta data but we seem to be asking very unintelligent questions worthy of McCarthy / Stasi era paranoia.