[@KoL]
Endian's initial statement of creating 'peace', even through Machina domination, resonated with many people. Bonesword's statement of respect was even better.

Besides, if someone joined her without believing in her cause they're a moron. It's not really a drawback that she'll crush allies who don't follow her cause, considering her cause is the only reason people are willing to follow her.

It was pretty obvious at the Dungeon that many people agreed with Helena's ideas. Getting people to agree with your ideas is what a good spokesperson does. She even got Henry to switch sides.