While the TSA is messed up and all that, Americans shouldn't be too quick to turn to private companies. Private companies would be profit focused, this means that any way to minimise costs will be taken which may compromise security. I give you Blackwater in Iraq as a good example
Also, since when is "profit" a bad word? Using the means of free trade to improve one's situation is the foundation of civilization. People act as if the quest for profit turns you into some sort of Scrooge McDuck figure who counts dollars and stashes money away never to be seen again.