plun·der
      (v) Steal goods from;
      (n)  The violent and dishonest acquisition of property.

I think using the public domain is a good thing. I think that describing it as "raiding" and "plundering" when someone you don't like does it is bullshit.

I don't think anyone who's using the term thinks plundering the public domain is a bad thing

Then why would you use the word plundering to describe it? That's like saying rape is part of a normal and healthy marriage. If you don't mean rape, don't call it rape.