The mining point argument is a bit iffy. It mostly comes down to courtesy, if you ask me (Keep in mind, this is IMHO). I've been in a situation like that once, while harvesting. I saw someone standing in front of a Harvesting Point but went ahead with my sickle anyway. Awhile later, I get a /tell about it... and it turned into a small argument, and this person decided to leave the area. I consulted my LS members about it, and apparently there does seem to be an unwritten rule about people camping Mining/Logging/Harvesting Points. Pondering further, I also came to realize that had I been in that person's shoes, I would have appreciated it greatly if someone left that spot I was standing right in front of to me. Upon that, I sent a /tell back to apologize, and that person was understanding enough to talk things through with me. I seldom do those activities these days, but if I were to start again, yes, I'd leave the camped spots to the people there.
...Back on topic though. Someone who 'steals' a mining point might not really be wrong (it depends on perspective, largely, as some of the above posts have portrayed), so to speak. However someone who fools another into thinking they'd be teaming up and instead Warp II's them away...? That's not right. That being said though, I'm not sure the right way to handle the situation is to "make his life a living hell"... simply because I don't deal with stuff like that. But, I will take note of this name, and be wary of any possible future encounters. So, thanks for the heads up.