So this is a bit misleading, but some explanation of what's happening here: Every 20 seconds, the OPFOR in a mission will assess targets it is aware of, and make decisions about whether to stay in a patrol or leave patrol to attack units who are deemed a threat. Since TheScar was the only unit attacking them, he was the only threat, so they all assigned a search and destroy waypoint and went out to attack him... which probably didn't turn out well.
I should also add that the four players entering the south of the AO haven't been targetted (no, I'm not really picking on TheScar) simply because they haven't yet been detected by OPFOR. Once they do, the target with the highest threat value will be selected and the waypoint will redirect to them.
ARMA tip no.478:
setup emergency stashs to change the pace of game anytime to your liking
be creative,ARMA doesnt know limits
dont fall for trap questions for example "didnt we had a Rhino this morning"