In this episode I believe that June has come full circle and embraced her anger and desire for revenge. Another glimpse of how single-minded June has become. She is not concerned by the consequences of her actions and how they would effect others she's only concerned about seeking revenge regardless of what it costs.
Moira is loosing ground with June because she wants to put the past behind her and move on, and doesn't want to address the same pain she shares with everyone else. Junes actions will eventually end up costing her something ,I'm curious to find out what it may be this time.