It's all right. It probably started when one of the people here convinced Sentience to try its creators -- the Engineers -- for kidnapping all of us. The Engineers were brought into the dome with the rest of us, and a short while later they decided that Sentience's program had become... corrupted, or something. So they brought in a new version of its AI and it is now currently a prisoner here.
[ but then he pauses to consider her question. ]
I'm not sure how much we could have done in the second rash of monster incidents, to be honest. But it never hurts to have a more thorough plan.