I've ran an exit node in my home for several years and the worst I've seen as a result of it is several DMCA notices and one polite call from the police in another state.
Even that is too much contact for some people. A sane average person wants as little contact with the legal system and authority types as humanly possible, and for good reason.
Even if so far everyone has that exact worst case experience, that doesn't mean tomorrow you won't be arrested for somebody viewing illegal material through your exit host. I know people who've sold drugs and never had any problem, it doesn't mean I'm going to start doing it presuming its safe based off their anecdotes.
That is very much like saying you shouldn't express your political views because you don't know if tomorrow they'll be made retroactively illegal.
And the criticism of anecdotal evidence is that it may not be a representative sample. So what is the actual percentage of Tor exit node operators who have been incarcerated for it in the US then? Is it not 0%?
