How do the TSA keep getting away with it?

Seriously, with all reports of TSA nastiness, how is it that nothing is being done about their thieving, groping ways?

http://blog.chron.com/txpotomac/2012/04/rep-francisco-canseco-claims-tsa-assault-after-security-screening/
http://www.nypost.com/p/news/local/tsa_on_the_gropes_kpHmWKHzOuaMr15xfh64vI?utm_medium=rss&utm_content=Local
http://washington.cbslocal.com/2012/04/25/family-misses-flight-after-tsa-gives-pat-down-to-girl-with-cerebral-palsy/
http://www.businessweek.com/ap/2012-04/D9UCKNRG0.htm
http://gawker.com/5904821/tsa-forces-four-year-old-girl-to-undergo-pat+down-after-unauthorized-hug-from-grandma