I understand this, when i was really new i did the same thing. Its a gamble do you hang around and get pwned or maybe just maybe you bumped into a nice person - some people dont want to take the chance.
Reading other posts about noobs raging because someone came along and killed them (the noob said hi but paid the price).
Also saying "wait wait i wont hurt you" wont help either because griefers and other scum say the same thing to earn your trust and kill you.
Best thing to do is keep some distance away, and just ask them what theyre doing. A guy came by when i was fishing and i was ready to abandon the boat and fuck off out of there, but then he said "what you fishing?", i replied "dunno im using leeches", then he said "ahh insta-fish, well good luck, fair well".
This made me more trusting and confident when dealing with other people i didnt know.
Lol Hazzor if you KO newbs they will think their paranoia was justified.