Some people want to watch the world burn. Back in the olden days when fewer planets were locked down by controlling factions and build wars were more common, people would sometimes build them to intentionally ruin the stats of an enemy's planet. Others I think, weren't even all that interested in what they did to the stats -- they built them for the RP value (which used to be much more prominent, before spreadsheets and calculators took over the game).
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