Be careful, you're treading into muddy waters, and it's not necessary for your argument.
Consider a few problems with your statistics. First, 20k of those gun deaths in the US are suicides, which distorts the statistics into pretending to show a certain level of gun violence that's not actually evident. Second, dying in terrorist attacks is not the same thing as dying at the hands of terrorists or terrorist organizations. There are tens of thousands of people being killed every year in Syria, for example, at the hands of al qaeda or other terrorist aligned soldiers. There have been about ten thousand people killed every year in Mexico at the hands of drug cartels in what is effectively a weird kind of civil war happening there. During the Iraq war and during the war in Chechnya terrorists and terrorist aligned fighters killed tens of thousands of people, many of them civilians.
Moreover, very few people die every year from jet crashes. However, that low figure is due to a truly enormous amount of effort and resources put forth, probably in the trillions of dollars per year range, to keep air travel safe and reliable.
That's the danger of using naive statistics and straight death-toll comparisons the way you are doing. Sure, more people are going to die from cheeseburgers than likely will ever die from terrorism. But A: overall that's a good thing, and B: it's not necessarily meaningful.
More importantly, there are much more direct and more substantive attacks against NSA surveillance effectiveness, TSA screening, etc.
For example, with regard to TSA screening it's notable that the TSA has not thwarted even one terrorist attack on a plane since 9/11. However, there are many documented accounts of TSA failures to prevent weapons of various sorts (knives, guns, even bombs) from getting on planes. And there have been attempted attacks on planes which the TSA did not stop but which passengers did.
The case with regard to the ineffectuality of the NSA's surveillance efforts is even stronger. They put out a list of foiled plots where the NSA surveillance had some role and it is wall to wall bullshit. Most of the "plots" are little more than entrapment, and there appears to be no case at all where surveillance was the lynchpin that made the difference between shutting down a plot when that plot would have gone undetected without the surveillance data. Worse yet, there are several examples of cases, such as the Tsarnaev brothers, of outright incompetence where the FBI/NSA et al had a case handed to them on a golden platter and they screwed the pooch and let someone they were warned about end up murdering American civilians. And one has to wonder if those sorts of failures, which vastly outweigh the vast majority of phony "successes", happened because federal law enforcement agencies were too focused on this high-tech bullshit instead of actually doing their fucking jobs.