We can argue about what qualifies as 'standard' - although I don't think any of us have access to much in the way of quantification regarding arguments for and against the TSA. Proof to the contrary would be a pleasant surprise.
I hope it suffices to say that most people who are concerned about the TSA are concerned about rates of detection and perceived effectiveness of techniques versus cost. Even if not everyone would be so wordy.
Google search for "tsa never caught a terrorist":
http://www.slate.com/articles/news_and_politics/explainer/20... (Slate pointing out that the TSA doesn't catch terrorists, making special note of the fact that they have not bragged about doing so.)
http://disinfo.com/2012/03/has-the-tsa-ever-foiled-a-terrori... (blogspam about an economist article written by Bruce Schneier about the TSA never catching terrorists. Bruce Schneier is likely the most prominent person that points out that the TSA never brags about bagging one. I would wager that he popularized the point.)
http://tsanewsblog.com/3160/news/tsa-executive-admits-not-a-... (TSA official asked directly if they have ever caught a terrorist.)
Google search for "tsa never found a gun":
The popular question is "if the TSA has caught a terrorist, why haven't we heard".
"If the TSA has never found a gun, why haven't we heard?" is foolish and as far as I can tell almost never asked.