This is typical mob mentality. If no justifiable targets of mob violence turn up within a certain length of time (and that time can vary from a few days to a few months, depending on the character of those making up the mob: that is, their degree of bloodlust), then they will simply fabricate charges. This gives them the opportunity to vent the poison within, to feel powerful for a moment, to sate their perverted propensity for violence, and slake their cruel craving for blood.
For monsters like these, the thrill is greater when the prey is weaker: women, children, old people, the mentally or physically infirm: these are prime targets for such fiends.
The worst thing about this sort of thing is not that such packs of predators exist—and even flourish in certain social climates —but that an entire world “religion” ignores their depredations, and even actively encourages such bestial behavior!