You're asking what one form of doxing has to do with another? Well... they're both forms of doxing. You seem to arbitrarily consider one form a problem, but not the other.
That is correct. Just because you apply some name with negative message board valence to a set of conduct, that doesn't by itself make it reasonable to condemn every behavior in that set. This seems pretty obvious to me. What am I missing?
They can report on people using pseudonyms by referring to the pseudonym. This is done all the time when referring to tweets, etc. And, yes, people certainly exist who get offended and decide to harass/threaten others as a result. There's no real downside to making it harder for people to do so.