Pirates need to use their LEVs
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They at least need to construct a Light Factory because once the ships at the base have all been destroyed from raids, the pirate base is EXTREMELY easy to take. Even if you don't take it the pirate raids stop. Once I put a 18k bounty on an AI and they launched a raid (I had a scout there to see what was happening) and I thought to myself "What a wonderful world"... no actually I thought "Shouldn't this raid be bigger?" Turns out they were just using the ships that they had at their base. The raid, as most raids do, didn't wipe out his planet and then the AI counter attacked the pirates. Since there were no ships there they AI took it unopposed. The pirates have LEVs, so why don't they use them?
Picture of the raid's size:
Picture of the raid's size: