So I love this game but the Peacekeepers are terribly implemented.  They only seem to care about what the player is doing and ignore the AI.  They are also too powerful when they show up.  I had to mess around with the xml files to make the game playable again. Don't know if its perfect yet but I will come back to post if I encounter any problems.  If anyone is interested, I stunted them from my game with the following fix:

In the the file called "Peacekeepers_MegaEventDefs" located at C:\Program Files (x86)\Steam\steamapps\common\Galactic Civilizations III\DLC\DLC2_MegaEvents\Game folder I changed "weight" and "turns" to show the following:

<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
<MegaEventList
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="../../../Data/Schema/MegaEventDefs.xsd">
<!-- Created with the Gal Civ 3 Editor -->
<!-- Peacekeepers_MegaEventDefs.xml -->
 
  <MegaEvent>
    <InternalName>Peacekeepers</InternalName>
    <Weight>0</Weight>

    <Prerequ>
      <Turns>900</Turns>
      <WarTurns>10</WarTurns>
    </Prerequ>
 
    <Scenario>
      <InternalName>Peacekeepers_Peacekeepers</InternalName>
      <DisplayName>Peacekeepers_Peacekeepers_Name</DisplayName>
      <Description>Peacekeepers_Peacekeepers_Dec</Description>
      <ShortDescription>Peacekeepers_Peacekeepers_ShortDec</ShortDescription>
      <ScenarioTriggerSet>Peacekeepers_Peacekeepers_TriggerSet</ScenarioTriggerSet>
    </Scenario>
 
  </MegaEvent>
 
</MegaEventList>

Edit: Ok so I tested it and it works.  yay no more peacekeepers