It's customary in some contexts to italicize "loan words". The terms for the fallacies come from the Latin. Ergo...
As for your second point, I think it's pretty clear from both my comments and their context why I'm pointing out those fallacies. That said, in the case of "non sequitur", I was actually referring more to the literary sense of the term — "Where the hell did that come from?" — than the fallacious "does not follow" sense.