By gathering as much information as possible. The less we know, the more easily these people can confuse and control us, right?

[She smiles.]

And the more we know about the people we're here with, the easier it will be to tell if they start acting strangely. Then we'll know something's up and we can help them if they need it, without them even having to ask.

[Or, y'know... they could execute them for being suspicious as fuck...]