[Nitram Draw]

You can make Pirate colonies naturally get angry by giving the ability Planet - Population Anger Change to each Pirate specific facility that you think should only be built in limited quantities, but not the slave mine I think Pirates would like them! This will cause anger to increase every turn unless you counter it with troops, ships etc. If the modifier stacks or you give some facilities Planet and some System abilities, the more you build the angrier your colonies will become.