Needless to say that stalking activity, no matter by individual, or by group, is illegal in our society. It is a criminal behavior. It is very intrusive, offensive and threatening to a person being stalked. When having enough evidence, the stalker or stalkers are subjected to criminal charge, facing a sentence of up to many years jail time depending on its severity and damage they caused to the victims.
But if you can analyze the nature of group stalking, it is not hard to see the reason why the perpetrators do this apart from the criminal nature. Curiosity is another factor, which is an addition, just like alcoholic or drug addict. Once start, it is likely to become addicted to it. Human nature of curiosity with the help of hi-tech device drives these criminals into this covert ugly game, especially those who are under the hat of intelligence community. They abuse their power and walked extra miles just to satisfy their own curiosity. Some perpetrators have no quality lives of their own, no career goal to obtain, and no motivation of self-improvement. Instead, these psychopaths show great interest to ruin others people's lives in order to balance their own. I paid close attention to the perpetrators who actively participated in harassing me, and come to a general conclusion that most aggressive harassers are of negative personality, and of poor morality. It gives them great release or satisfaction to see that the victim showed frustration, humiliated or in great distress because of their dirty work.
Stalking addiction would drive the perpetrators to continue the illegal game just like the drug addicts couldn't get rid of the drug. The mentality is pretty much the same. If one victim is strong enough to get over their malicious harassment, they would move on and target the next one. They wanted to see how victim suffer, and struggle because this is the psychological "drug" that made them feeling good about themselves. Without the "drug", their lives are too dull and lack of excitement. You can see how disappointed they could be when their carefully pre-planned setup failed. I saw many times and I fully understand their mentality now. Once you understand them, it is so easy to keep them disappointed. Don't play the game with them is the best solution to keep them disappointed.
However, I still don't understand why those people could hate a person whom they don't even know? Is it the rule of jungle or pure animal instinct to keep this ugly game alive?