He was saying that people won't be happy being forcefully robbed of their items for no real reason, items that they've spent hours working for.
That's his point.
also, it doesn't increase the danger in the IZ if everyone's allowed to mug whoever for whatever because "I need x". I was actually careful before, but now I don't exactly give a shit about my character if I know there's the very real possibility of losing my good shit because generic male01 bandit gang number 38 wants a knife. I'd rather lose it all in a fight with CPs than have Joku's gang take it because they want it.
Bandit groups like these add nothing to RP except causing more frustration for players, making those who've invested into their characters leave the server entirely. They are almost always formed OOC and rarely have much character development, if any at all. They simple want scripts, and will die by the end of the week. For example, some of the guys who mugged me are already dead because they didn't care about their characters, getting into a fight with OTA and obviously losing.