A covert illegal mass surveillance program is a lot different than a judge approved wiretap on a specific person based on reasonable suspicion. There were literally only 3,168 approved wiretaps in 2016 [0] and as my other comment mentioned, it has even been used to catch politicians of illegal activity [1].
I don't see any way to keep those ones and to restrict the mass surveillance in the same time. These few lawful interceptions are not doing enough good to me to counter-balance the availability of the mass surveillance programs. So that's why I argue about shutting off interception as much as possible technically.
[0]: http://www.uscourts.gov/statistics-reports/wiretap-report-20...
[1]: https://news.ycombinator.com/item?id=18104461