Well, I'm not a lawyer, but in my book copyright infringement (which if anything, is what this was) is not the same as plagiarism.

stealing names << stealing storyline 'ideas' and/or actual sentences from another work

(or maybe it should be >> ??, you get my point though, it's not as big stealing names)

Writers are inspired by all sorts of things. In fact, I'm sure many writers (and I include myself as an 'amateur' fan-fic author who encounters this often) come up with proper names they think are original only to realize later that they were sitting in the back of their mind from reading it somewhere else.

And that doesn't even include characters or places who are homages or satires of those in another literary works, or names considered to be "public domain."

As far as ideas go, literary templates and archetypes are used freely. In the case of fantasy, the unlikely 'hero of prophecy' from an orphaned or meager upbringing wielding a weapon of power (overwhelming "love" in Harry's case) against a villain obsessed with transcending death or amassing phenomenal powers is about as standard as you can get. As long as an author fills in the details with original material, there's no reason to get all in a tizzy over it IMO.