This doesn't seem like a controversial statement - of course their job is to prevent a terrorist attack. We can argue about how well they do that job, and what collateral damage they create while doing it, but that's their job.

The statement I found absurd was the following:

Our Officers work in an environment in which 99.9 percent of the people they see every day are not a threat

So, she's implying that 1 in 1000 passengers is a threat? If that's the case, and given that there are about 770MM emplanements each year, then 770k passengers are a threat, which means that (with 10MM annual departures), 7% of flights have a terrorist on board. Either that, or TSA is turning away 770k/year and keeping them from flying. Neither seems remotely plausible.

Also, on the issue for which she was testifying (performance-based pay) I tend to agree with them - it's a good thing.