Earlier quoted context omitted.
The dragnets existed before 9/11. That just gave justification for even more funding.
Which programs do you mean specifically? We know the nature of the mass surveillance changed and expanded immensely after 9/11 in a major way, especially domestically.
So there was a substantial effort to weaken cryptography, decades before 9/11.
On the dragnet surveillance front, there have long been rumours of things like ECHELON [1] being used for mass surveillance and industrial espionage. And the simple fact US spies were interested in weakening export SSL rather implied, to a lot of people, they had easy access to the ciphertext.
Of course, this was before so much stuff had moved online, so it was a different world.
[1] https://en.wikipedia.org/wiki/ECHELON [2] https://en.wikipedia.org/wiki/Clipper_chip [3] https://en.wikipedia.org/wiki/Export_of_cryptography_from_th... [4] https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_i...