If they could show that, credible evidence would have presented by now. ;)
But in all seriousness, the 1st & 4th amendment protections are the most vital freedoms we have and they should not be abridged outside of a direct link to harm. [e.g. Things like child porn, words designed to incite violent harm, violent prisoners shouldn't have privacy ]
So you have to be rational about it but yeah, mass surveillance and reducing self-defense tools to protect ourselves against criminals isn't "rational" behavior.
Criminals are going to do illegal things and we have the right to protect ourselves. If it inconvenience the government? So be it. I'm not going to bend over for any criminal who wants access to my financial data "because Terrorism".
Similarly, banning tools of self-defense [e.g. encryption for financial data, access keys] are simply guaranteeing the criminals will be the only ones to possess them.
I'm aware alot of people will be like "what about the 2nd"??
Yeah, that provides no protection against the government since they'll always have the ability to drop bombs on you. When you can afford a F-16 and the ability to pilot it for "self defense" purposes, let me know.