If we're going to talk about expectations of mature players, then I'd ask why we continuously have threads started by adult players who have made the choice to play in open mode?
In open, players might kill you. That's the risk you take when you select open mode. The adult thing to do isn't to run to the forums and complain or demand changes. Instead, accept that you made a mistake in evaluating the level of risk you were prepared to live with, and then play in solo mode or one of the groups.
I trade in open. I accept that I might well lose a significant amount of my wealth. I'm also happy to fight against other players in order to defend myself. Space is dangerous.
Ease up there boss, I didnt see any changes demanded. The forums are for communicating with other players, and he was curious if this was acceptable / normal behavior and if there were consequences, and wanted to ask some experienced players how he should go about handling it. I see zero reason for that kind of hostility on any day, and particularly not on Christmas. I think another shot or two of rum in your eggnog is called for. Sheesh.