That, "if you got nothing to hide..." is such BS.
Well if you've got nothing to hide, why are you wearing clothes? It's not cold out, it's summer, so take off your clothes. Let me look at your bank records, your medical records, your records from school. You've got nothing to hide, right?
It's personal information. If I want to call the phone sex operator, that's my business, not yours, not the government's, or anyone else's besides me and Latisha.
If I've got multiple calls going to the middle east, that would be a cause for investigation, and that was outlined in the original FISA. Then they added that they could monitor all calls made to/from outside the US. Then they kept adding more amendments to the FISA, until now they can monitor all telephony metadata(who you called/texted, what time, and your geographical location) and all internet data.
Their logic, once you transmit or send, it's no longer yours, so it no longer has fourth amendment protection. Your phone records and data belong to the provider, so they don't need a warrant on you to obtain that info.