Simon: He probably believes that his past behavior of bullying people into silence / grabbing what isn't his, can still work.
It's all he knows. Even his "woe is me" schtick is meant to galvanize support against his critics. If he isn't trying to bully people directly, he is trying to get others to do it for him. The problem is two-fold: not only are there fewer people willing to defend him, some of the ones that do are confronted with the evidence, and realize that they cannot support him anymore. Sending his followers after someone now carries the risk that they will "switch sides." At the very least, it means one less person giving him money.
For all of his cries of defamation campaigns and false accusations, the evidence being presented to those people is his own words. And if they're not convinced that the letters he wrote or posts he made are legit, there's still the livestream video. So, I would recommend that he keep sending his supporters out to confront his critics; it's a great way to free them from his influence.