^This person is wrong. FISA and FBI counter-intel have a low bar to get warrants because that's what congress intended.
In 33 years the FISA court granted 33,942 warrants, in that same time only 12 were denied, a rejection rate of 0.03% [0]
[0] https://en.wikipedia.org/wiki/United_States_Foreign_Intellig...
From a logical perspective, it could mean that those submitting requests are able to avoid sending weak ones and choose to do so.
I'm not saying I believe you/the standard view is wrong, but there must be some other evidence.
I've deftly avoided ever taking a class in statistics, but I have gathered there are two schools - Bayesians, who are honest about having priors, and everyone else.