I'm sure the stats for all types of foot fungus and athelete's foot have increased due to all the barefoot passengers standing in those tsa lines though [especially in summertime].
Pull the TSA out of all the airports, it is a gargantuan waste of time and money [our money!] Stop the insanity now! We are no safer than we were 5 years ago, but we are a lot poorer. [end of rant]