I'm not sure to what extent pro-c people actually do any c-ing versus just believing that it should be legal. Does anyone know?
I don't agree with pro-c'ers, but I'm not sure to what extent the latter is problematic. I guess being "problematic" is subjective, so anything you strongly disagree with is then "problematic." From a more objective perspective, though, the latter does not cause any harm*, so I wouldn't call it that.
*There is a caveat here: perhaps being vocally pro-c would encourage others to actually c. I don't know. 