I will say in my own defense that the new mining system makes it really easy for me to fill up my bags with gems/motes/crystallized elements, and I can think of one time out in Netherwing where i got attacked by a 100K elite mob while trying to make room for a gem from a Nethercite node and had to run. So some poor sucker will work his way over to that node only to find a piece of Golden Draenite or something. Mea culpa.

But the idea of intentionally taking JUST the ore and leaving everything else (or putting your own junk in the node -- I didn't even think it was possible!) not only horrifies me, it doesn't make sense. I thought that the ore node population was consistent; you mine a node and a new one spawns somewhere else in the zone. In that case, aren't you making your own farming harder by having to remember which nodes you polluted?

As for the guy who was trashing Netherwing Eggs for fun, I don't think that there's much you can do about it. If he was following you around sniping your ore and eggs, you could report him for harassment; if he's just killing a little time, the best you can do is come back later.

There is always a small percentage of people who get their kicks griefing, and the best you can do is avoid them or report them, because any other reaction is giving them the attention they want.