You'll be hard pressed to find an admin that will sanction a guy for making a higher demand of a trader after the trader refused the pirates first demand by destroying the cargo. More than likely, you'll find an admin that sanctions the trader for filing a report on the pirate.
I was going to post more, but there is no point in it - both sides are to blame for the excessive demands and grieving on both sides. Problem is, the bulk of both sides are people like Ursus who only further the problem.