Traders make a lot of money. There are a lot of traders.
Pirates steal maybe 1/4 of a traders earnings from that one route. Pirates only successful 1/4 of the time. There are less pirates than traders.
Lawfulls are everywhere. Lawfulls, for the most part, are on the side of the traders. Lawfulls outnumber pirates more than half of the time. Lawfulls + every other non-pirate fight the pirates.
Pirates are little. Everything else is big. Big picks on little.