He may have referred to the undeniable fact that
thinking (and, by extension, showing that you are thinking by sharing your thoughts) unamerican / unpatriotic / improper / disturbing / confusing / trouble-causing thoughts can get you <a href="http://www.courttv.com/trials/taped/sierra/background_ctv.html">in trouble</a> in 'today's socio-political climate.'
I never thought I'd have to type those words ever since I last thought and wrote about how people acted in the late 60s and early 70s, how it was 'be with us or against us', how it was 'love America or leave it', and how socio-politics in part of the US has come full circle.
X.
PS: There are so many more instances of 'unhelpful thinking' being persecuted lately documented on the web that I'd care to think about. The above link is merely a simple example of.. justice.