Well they use those same tactics to catch many home born / islamist radicals in America before they try to bomb/plot something against us. So without this program, there would be x10 more terrorist incidents in America if not more, there was a study they conducted about it which I will try to find. Snowden is not a hero in my opinion, and hes not a whistleblower, yet hes not exactly a traitor.. he just violated his confidentiality agreement with NSA. Not to mention both China and Russia have similar programs if not more intrusive with their citizens. The government again has the ability to spy pretty much anything we have, its just which people they choose to do it on, and if they choose to do it on people who talk about terrorist plots or bombings, then that should be accepted.