Using Tor does put you on some kind of list, but you aren't going to get charged with aiding terrorism or looking for child pornography because of it. Unless you use it for those things, I guess, and get caught.
What is this based on? If it's rationality, that doesn't always apply to legal and political matters, to the very human human beings who make those decisions, or to the politial situation around them.
http://www.wired.co.uk/news/archive/2014-07/04/nsa-targeting...